{"id":9030,"date":"2025-03-17T08:47:26","date_gmt":"2025-03-17T08:47:26","guid":{"rendered":"https:\/\/www.design911.co.uk\/blog\/?p=9030"},"modified":"2025-06-18T07:17:37","modified_gmt":"2025-06-18T06:17:37","slug":"porsche-964-3-6l-to-3-8l-conversion-the-ultimate-upgrade-guide","status":"publish","type":"post","link":"https:\/\/www.design911.co.uk\/blog\/porsche-964-3-6l-to-3-8l-conversion-the-ultimate-upgrade-guide\/","title":{"rendered":"Porsche 964 3.6L to 3.8L Conversion: The Ultimate Upgrade Guide"},"content":{"rendered":"<p data-start=\"439\" data-end=\"803\">The <strong data-start=\"443\" data-end=\"482\">Porsche 964 3.6L to 3.8L conversion<\/strong> is one of the most popular performance upgrades for air-cooled Porsche enthusiasts. This engine upgrade allows owners to unlock the true potential of their 964, delivering more power, more torque, and a sharper, more responsive driving experience\u2014all while preserving the iconic naturally aspirated character of the car.<\/p>\n<p data-start=\"805\" data-end=\"1006\">In this guide, we explore the ins and outs of the <strong data-start=\"855\" data-end=\"894\">Porsche 964 3.6L to 3.8L conversion<\/strong>: how it\u2019s done, how much power it adds, what parts are needed, and whether it\u2019s the right upgrade for your 964.<\/p>\n<h2 data-start=\"1013\" data-end=\"1063\"><strong data-start=\"1016\" data-end=\"1063\">The Legacy of the Porsche 964\u2019s 3.6L Engine<\/strong><\/h2>\n<p data-start=\"1065\" data-end=\"1355\">Introduced in 1989, the <strong data-start=\"1089\" data-end=\"1104\">Porsche 964<\/strong> marked a significant step forward from the classic 911 Carrera 3.2. It featured the newly developed <strong data-start=\"1205\" data-end=\"1233\">M64 3.6L flat-six engine<\/strong>, producing around <strong data-start=\"1252\" data-end=\"1272\">247 bhp (184 kW)<\/strong> and <strong data-start=\"1277\" data-end=\"1299\">228 lb-ft (310 Nm)<\/strong> of torque in standard Carrera 2 and Carrera 4 variants.<\/p>\n<p data-start=\"1357\" data-end=\"1739\">This engine was revered for its <strong data-start=\"1389\" data-end=\"1425\">reliability, robust construction<\/strong>, and its ability to handle upgrades\u2014qualities that make it the perfect base for conversion. Porsche themselves recognised the potential of this engine; the <strong data-start=\"1582\" data-end=\"1598\">3.8L variant<\/strong> was offered in higher-spec models like the <strong data-start=\"1642\" data-end=\"1664\">911 Carrera RS 3.8<\/strong> and <strong data-start=\"1669\" data-end=\"1684\">911 3.8 RSR<\/strong>, both of which have become legendary among collectors.<\/p>\n<p data-start=\"1741\" data-end=\"1860\">Today, enthusiasts can perform a similar <strong data-start=\"1782\" data-end=\"1809\">3.6L to 3.8L conversion<\/strong>, bringing their road car up to RS-spec\u2014and beyond.<\/p>\n<h2 data-start=\"1867\" data-end=\"1924\"><strong data-start=\"1870\" data-end=\"1924\">Why Perform a Porsche 964 3.6L to 3.8L Conversion?<\/strong><\/h2>\n<p data-start=\"1926\" data-end=\"2185\">For many 964 owners, the goal is to <strong data-start=\"1962\" data-end=\"2043\">enhance performance while maintaining the purity of the air-cooled experience<\/strong>. Turbocharging and supercharging offer big horsepower numbers, but they also introduce complexity, weight, and a different driving character.<\/p>\n<p data-start=\"2187\" data-end=\"2258\">By increasing displacement to <strong data-start=\"2217\" data-end=\"2231\">3.8 litres<\/strong>, the engine benefits from:<\/p>\n<ul data-start=\"2259\" data-end=\"2628\">\n<li data-start=\"2259\" data-end=\"2374\"><strong data-start=\"2261\" data-end=\"2282\">Higher horsepower<\/strong> \u2013 Factory-spec 3.8L builds produce <strong data-start=\"2318\" data-end=\"2333\">296-300 bhp<\/strong>; tuned builds can reach <strong data-start=\"2358\" data-end=\"2373\">320-360 bhp<\/strong>.<\/li>\n<li data-start=\"2375\" data-end=\"2460\"><strong data-start=\"2377\" data-end=\"2397\">Increased torque<\/strong> \u2013 Enhanced low-end and mid-range power for better drivability.<\/li>\n<li data-start=\"2461\" data-end=\"2546\"><strong data-start=\"2463\" data-end=\"2493\">Improved throttle response<\/strong> \u2013 Naturally aspirated performance with no turbo lag.<\/li>\n<li data-start=\"2547\" data-end=\"2628\"><strong data-start=\"2549\" data-end=\"2581\">Stronger top-end performance<\/strong> \u2013 Perfect for spirited driving and track days.<\/li>\n<\/ul>\n<p data-start=\"2630\" data-end=\"2788\">In short, a <strong data-start=\"2642\" data-end=\"2681\">Porsche 964 3.6L to 3.8L conversion<\/strong> transforms the car into something truly special\u2014more urgent, more capable, and more exhilarating to drive.<\/p>\n<h2 data-start=\"2795\" data-end=\"2853\"><strong data-start=\"2798\" data-end=\"2853\">How the 3.8L Conversion Works: A Technical Overview<\/strong><\/h2>\n<h3 data-start=\"2855\" data-end=\"2875\"><strong data-start=\"2859\" data-end=\"2875\">The Process:<\/strong><\/h3>\n<p data-start=\"2876\" data-end=\"3118\">The conversion involves <strong data-start=\"2900\" data-end=\"2944\">boring out the engine\u2019s cylinders by 2mm<\/strong>, taking displacement from <strong data-start=\"2971\" data-end=\"2993\">3,600cc to 3,746cc<\/strong>. This requires <strong data-start=\"3009\" data-end=\"3032\">precision machining<\/strong> of the engine case, making the conversion <strong data-start=\"3075\" data-end=\"3117\">more complex than a simple bolt-on mod<\/strong>.<\/p>\n<h3 data-start=\"3120\" data-end=\"3152\"><strong data-start=\"3124\" data-end=\"3152\">Key Components Required:<\/strong><\/h3>\n<ul data-start=\"3153\" data-end=\"3285\">\n<li data-start=\"3153\" data-end=\"3172\"><strong data-start=\"3155\" data-end=\"3172\">102mm pistons<\/strong><\/li>\n<li data-start=\"3173\" data-end=\"3197\"><strong data-start=\"3175\" data-end=\"3197\">Matching cylinders<\/strong><\/li>\n<li data-start=\"3198\" data-end=\"3225\"><strong data-start=\"3200\" data-end=\"3225\">Wrist pins &amp; circlips<\/strong><\/li>\n<li data-start=\"3226\" data-end=\"3244\"><strong data-start=\"3228\" data-end=\"3244\">Piston rings<\/strong><\/li>\n<li data-start=\"3245\" data-end=\"3285\"><strong data-start=\"3247\" data-end=\"3285\">Machine-in fitment for engine case<\/strong><\/li>\n<\/ul>\n<p data-start=\"3287\" data-end=\"3553\">For a high-quality kit, check out the <strong data-start=\"3325\" data-end=\"3485\"><a href=\"https:\/\/www.design911.co.uk\/p\/piston-engine-set-porsche-964---993-turbo-36l-to-38l--102mm\/\" target=\"_new\" rel=\"noopener\" data-start=\"3327\" data-end=\"3483\">Porsche 964 \/ 993 Turbo 3.6L to 3.8L 102mm Piston &amp; Engine Set<\/a><\/strong> from <strong data-start=\"3491\" data-end=\"3505\">Design911<\/strong>\u2014a trusted source for Porsche performance parts.<\/p>\n<h3 data-start=\"3555\" data-end=\"3588\"><strong data-start=\"3559\" data-end=\"3588\">Optional Supporting Mods:<\/strong><\/h3>\n<p data-start=\"3589\" data-end=\"3633\">To maximise gains, many owners also install:<\/p>\n<ul data-start=\"3634\" data-end=\"3752\">\n<li data-start=\"3634\" data-end=\"3666\"><strong data-start=\"3636\" data-end=\"3666\">High-performance camshafts<\/strong><\/li>\n<li data-start=\"3667\" data-end=\"3697\"><strong data-start=\"3669\" data-end=\"3697\">Upgraded exhaust systems<\/strong><\/li>\n<li data-start=\"3698\" data-end=\"3728\"><strong data-start=\"3700\" data-end=\"3728\">Free-flow intake systems<\/strong><\/li>\n<li data-start=\"3729\" data-end=\"3752\"><strong data-start=\"3731\" data-end=\"3752\">Custom ECU tuning<\/strong><\/li>\n<\/ul>\n<p data-start=\"3754\" data-end=\"3910\">When paired with these modifications, a <strong data-start=\"3794\" data-end=\"3816\">3.8L converted 964<\/strong> can rival the performance of modern sports cars while retaining its <strong data-start=\"3885\" data-end=\"3909\">classic driving feel<\/strong>.<\/p>\n<h2 data-start=\"3917\" data-end=\"3966\"><strong data-start=\"3920\" data-end=\"3966\">How Much Power Does a 3.8L Conversion Add?<\/strong><\/h2>\n<ul data-start=\"3968\" data-end=\"4161\">\n<li data-start=\"3968\" data-end=\"4026\"><strong data-start=\"3970\" data-end=\"4010\">Basic 3.8L conversion (stock setup):<\/strong> <strong data-start=\"4011\" data-end=\"4026\">296-300 bhp<\/strong><\/li>\n<li data-start=\"4027\" data-end=\"4076\"><strong data-start=\"4029\" data-end=\"4060\">With cams, intake, exhaust:<\/strong> <strong data-start=\"4061\" data-end=\"4076\">320-340 bhp<\/strong><\/li>\n<li data-start=\"4077\" data-end=\"4161\"><strong data-start=\"4079\" data-end=\"4144\">High-performance builds (ITBs, race cams, aggressive tuning):<\/strong> <strong data-start=\"4145\" data-end=\"4161\">350-360 bhp+<\/strong><\/li>\n<\/ul>\n<p data-start=\"4163\" data-end=\"4521\">For comparison, Porsche\u2019s own <strong data-start=\"4193\" data-end=\"4216\">3.8 RSR race engine<\/strong> produced <strong data-start=\"4226\" data-end=\"4242\">over 350 bhp<\/strong>, using similar displacement with racing enhancements. Some owners have reported achieving <strong data-start=\"4333\" data-end=\"4358\">360 bhp on a good day<\/strong>, revving to <strong data-start=\"4371\" data-end=\"4384\">7,200 rpm<\/strong>, according to discussions on <strong data-start=\"4414\" data-end=\"4520\"><a href=\"https:\/\/rennlist.com\/forums\/964-forum\/18841-3-6-to-3-8-conversion.html\" target=\"_new\" rel=\"noopener\" data-start=\"4416\" data-end=\"4518\">Rennlist\u2019s Porsche 964 forum<\/a><\/strong>.<\/p>\n<h2 data-start=\"4528\" data-end=\"4570\"><strong data-start=\"4531\" data-end=\"4570\">3.8L vs 3.9L, 4.0L, &amp; Turbocharging<\/strong><\/h2>\n<p data-start=\"4572\" data-end=\"4642\">While the <strong data-start=\"4582\" data-end=\"4601\">3.8L conversion<\/strong> is popular, some push the envelope with:<\/p>\n<ul data-start=\"4643\" data-end=\"4923\">\n<li data-start=\"4643\" data-end=\"4717\"><strong data-start=\"4645\" data-end=\"4665\">3.9L conversions<\/strong> \u2013 More displacement, more torque, but greater cost.<\/li>\n<li data-start=\"4718\" data-end=\"4811\"><strong data-start=\"4720\" data-end=\"4735\">4.0L builds<\/strong> \u2013 Ultimate NA setup; often requires bespoke parts &amp; significant investment.<\/li>\n<li data-start=\"4812\" data-end=\"4923\"><strong data-start=\"4814\" data-end=\"4831\">Turbocharging<\/strong> \u2013 Offers more bhp per pound spent, but changes the car\u2019s character; more complex &amp; heavier.<\/li>\n<\/ul>\n<p data-start=\"4925\" data-end=\"5060\">The <strong data-start=\"4929\" data-end=\"4968\">Porsche 964 3.6L to 3.8L conversion<\/strong> strikes a perfect balance: <strong data-start=\"4996\" data-end=\"5059\">increased performance without compromising the car\u2019s purity<\/strong>.<\/p>\n<h2 data-start=\"5067\" data-end=\"5108\"><strong data-start=\"5070\" data-end=\"5108\">Pros &amp; Cons of the 3.8L Conversion<\/strong><\/h2>\n<h3 data-start=\"5110\" data-end=\"5123\"><strong data-start=\"5114\" data-end=\"5123\">Pros:<\/strong><\/h3>\n<ul>\n<li data-start=\"5124\" data-end=\"5349\"><strong data-start=\"5126\" data-end=\"5156\">Significant power increase<\/strong> over 3.6L stock.<\/li>\n<li data-start=\"5124\" data-end=\"5349\"><strong data-start=\"5178\" data-end=\"5206\">Naturally aspirated feel<\/strong>\u2014no turbo lag, linear power delivery.<\/li>\n<li data-start=\"5124\" data-end=\"5349\"><strong data-start=\"5248\" data-end=\"5299\">Maintains Porsche heritage &amp; driving character.<\/strong><\/li>\n<li data-start=\"5124\" data-end=\"5349\"><strong data-start=\"5304\" data-end=\"5326\">Proven reliability<\/strong> when properly built.<\/li>\n<\/ul>\n<h3 data-start=\"5351\" data-end=\"5364\"><strong data-start=\"5355\" data-end=\"5364\">Cons:<\/strong><\/h3>\n<ul>\n<li data-start=\"5365\" data-end=\"5600\"><strong data-start=\"5367\" data-end=\"5392\">Not a bolt-on upgrade<\/strong>\u2014requires engine machining.<\/li>\n<li data-start=\"5365\" data-end=\"5600\"><strong data-start=\"5424\" data-end=\"5439\">Higher cost<\/strong>\u2014especially with supporting mods.<\/li>\n<li data-start=\"5365\" data-end=\"5600\"><strong data-start=\"5477\" data-end=\"5497\">Labour-intensive<\/strong>\u2014expect several weeks\u2019 work.<\/li>\n<li data-start=\"5365\" data-end=\"5600\"><strong data-start=\"5530\" data-end=\"5566\">Not as powerful as turbocharging<\/strong>\u2014if sheer horsepower is your goal.<\/li>\n<\/ul>\n<h2 data-start=\"5607\" data-end=\"5661\"><strong data-start=\"5610\" data-end=\"5661\">Cost Breakdown: How Much for a 3.8L Conversion?<\/strong><\/h2>\n<ul data-start=\"5663\" data-end=\"5829\">\n<li data-start=\"5663\" data-end=\"5707\"><strong data-start=\"5665\" data-end=\"5691\">Piston &amp; cylinder kit:<\/strong> \u00a35,000-\u00a38,000<\/li>\n<li data-start=\"5708\" data-end=\"5749\"><strong data-start=\"5710\" data-end=\"5733\">Machining &amp; labour:<\/strong> \u00a33,000-\u00a35,000<\/li>\n<li data-start=\"5750\" data-end=\"5797\"><strong data-start=\"5752\" data-end=\"5781\">Supporting modifications:<\/strong> \u00a32,000-\u00a35,000<\/li>\n<li data-start=\"5798\" data-end=\"5829\"><strong data-start=\"5800\" data-end=\"5819\">Tuning\/mapping:<\/strong> ~\u00a31,000<\/li>\n<\/ul>\n<p data-start=\"5831\" data-end=\"5899\"><strong data-start=\"5831\" data-end=\"5846\">Total cost:<\/strong> <strong data-start=\"5847\" data-end=\"5867\">\u00a310,000-\u00a318,000+<\/strong>, depending on your build goals.<\/p>\n<p data-start=\"5901\" data-end=\"6024\">While this isn\u2019t a cheap upgrade, the <strong data-start=\"5939\" data-end=\"5994\">driving experience it delivers is worth every penny<\/strong> for the committed enthusiast.<\/p>\n<h2 data-start=\"6031\" data-end=\"6090\"><strong data-start=\"6034\" data-end=\"6090\">Final Thoughts: Should You Convert Your 964 to 3.8L?<\/strong><\/h2>\n<p data-start=\"6092\" data-end=\"6353\">If you want to <strong data-start=\"6107\" data-end=\"6149\">enhance your Porsche 964\u2019s performance<\/strong> while keeping it <strong data-start=\"6167\" data-end=\"6190\">naturally aspirated<\/strong>, the <strong data-start=\"6196\" data-end=\"6239\">3.8L conversion is the ultimate upgrade<\/strong>. It respects the car\u2019s heritage while elevating the driving experience with <strong data-start=\"6316\" data-end=\"6352\">more power, torque, and response<\/strong>.<\/p>\n<p data-start=\"6355\" data-end=\"6524\">For those seeking a <strong data-start=\"6375\" data-end=\"6405\">purist\u2019s performance build<\/strong>, it\u2019s hard to beat the <strong data-start=\"6429\" data-end=\"6468\">Porsche 964 3.6L to 3.8L conversion<\/strong>\u2014a perfect blend of classic feel and modern performance.<\/p>\n<p data-start=\"6531\" data-end=\"6883\">? <strong data-start=\"6534\" data-end=\"6700\">Ready to upgrade? Explore the <a href=\"https:\/\/www.design911.co.uk\/p\/piston-engine-set-porsche-964---993-turbo-36l-to-38l--102mm\/\" target=\"_new\" rel=\"noopener\" data-start=\"6566\" data-end=\"6698\">3.8L Piston &amp; Engine Set at Design911<\/a><\/strong><br data-start=\"6700\" data-end=\"6703\" \/>? Want to read real-world experiences? Check out the <strong data-start=\"6757\" data-end=\"6882\"><a href=\"https:\/\/rennlist.com\/forums\/964-forum\/18841-3-6-to-3-8-conversion.html\" target=\"_new\" rel=\"noopener\" data-start=\"6759\" data-end=\"6880\">Rennlist 964 3.6L to 3.8L conversion discussion<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Porsche 964 3.6L to 3.8L conversion is one of the most popular performance upgrades for air-cooled Porsche enthusiasts. This engine upgrade allows owners to unlock the true potential of [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":8564,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[276],"tags":[],"class_list":["post-9030","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-964-911-1989-1994"],"acf":[],"yoast_head":"<!-- This site is optimized with 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