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11-10-2014, 01:03 PM | #1 |
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✪ Alekshop 4.6L S65 Stroker - World's Highest HP NA Motor
Featured on BIMMERPOST.com Many of you have followed our US Spec M3 GTS built. Now that engine is completed and was put through 4,000 of track and street driving miles it's time to share the results. As many of you already know BMW GTS M3 came with 4.4L Stroker motor. We decided to build our US Spec GTS M3 with even higher displacement and decided to go with 4.6L Stroker motor. We were considering to go with Dinan's or RD Sport 4.6L storker motor for our build but decided to start from the scratch and build our own 4.6L stroker. A great friend of mine "regular guy" helped us with this project and his experience with the stroker engine builds made things much easier. Also we wanted to ensure our motor is built using only the highest grade components and we reached out to Mahle and Carrillo to get our pistons, wrist pins, and rods made. The crankshaft was also custom made with slightly larger rod journal clearance designed in. The pistons and wrist pins were custom made by Mahle @ 93.0 mm bore. Carrillo provided custom made connecting rods of custom length and pin bore sizes. A local shop helped us with the assembly of the motor. After looking at some stroker dyno's with our friend "regular guy" we though it would be beneficial to add mild cams to our motor. We've heard lots of people talking about adding cams to S65, but nobody seems to have followed through all the way through tuning and posting their results. So I think that makes us first to be able to run S65 with cams. We chose the mild Schrick 284-degree cams because they allow us to keep VANOS, whereas the higher duration Schrick cams do not. Now that the engine was build, we decided to take the car to ESS Tuning in Arizona and have AJ tune it on their dyno. We spent 4 days playing with different files, driving the car letting it to adapt and making changes as needed. it was a fun process and guy at ESS did an excellent job! The last part was to find out if and how much power this new motor is making. Dyno wizard with "regular guy" came to the rescue again! We took our US Spec M3 GTS to three different dyno's for testing. We ran both 94 octane, and standard California 91 octane. The 91 octane dyno's were run at the same facility as our baseline dyno before the motor swap. For the 94 octane dyno's, we decided to take our car to EAS in Anaheim, and Specialty-Z in Canoga Park California as many of the guys on the forums are using these places for their dyno runs and we thought it would be a decent comparison to other NA M3s. We dyno'd at both facilities on the same day, same gasoline, only hours apart. For anybody curious, both dyno's gave the same exact results (3-5hp apart) and even showed the same power band bumps and dips in the same exact locations. To us, these dyno's were identical to each other. From all the research online and going through S65 dyno database, we haven't found a street car that made more power than our 4.6L Stroker and we decided to claim to have the first World's Highest HP Street NA Motor Car and Modifications:
Station): Results: Dyno Database:
Results: Individual dyno results are shown below. SAE corrected results are shown twice, using two different sources. The first source (djc) are the SAE corrected results straight from the Dynojet. The second source (sae) of SAE corrected results are obtained by using the Kestral 4500 weather station data for each individual dyno run and running it through an independent SAE correction formula. This ensures that the dyno results are accurate and can be independently audited and verified for authenticity and accuracy. The legend below has the following meaning:
91 Octane: * Entry used for the Dyno Database Graphs: SAE Correction (94 Octane): SAE Correction (91 Octane): STD Correction (94 Octane): STD Correction (91 Octane): Uncorrected (94 Octane): Uncorrected (91 Octane): Engine Vital Statistics (91 Octane): Comparison:
Gains with Cams (91 Octane): Many people want to know how the cams worked out. The previous stroker builds all showed us that the strokers fall flat after about 7000 RPMs. I wanted to add cams to help fix this problem. Cams will give up torque on the bottom end and move it up top. But how much do we give up on the bottom, and how much do we gain on the top? Will the gains on the top be worth the sacrifice on the bottom? We think so. All of the strokers show very strong torque, usually about 75 ft/lbs over stock motors. So it should be worth giving up a little of this torque to smooth out and fix the top end gains. Our tests showed undeniable results. The cams gave up about 20 ft/lbs on the bottom, but gained the same exact amount on the top. In the process, we picked up 24 horsepower over the non-cammed stroker, and as the chart below shows, the cams really smoothed out the power curves up top. There is no doubt, the stroker motor needed cams to make it breath and perform better. Thanks for reading! Aleks. |
11-10-2014, 01:14 PM | #2 |
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Awesome work. What engine oil are you folks running in it?
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11-10-2014, 01:41 PM | #4 |
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I'm guessing around 26k, based off of Dinan's build.
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11-10-2014, 01:44 PM | #6 |
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Hump!
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11-10-2014, 01:48 PM | #8 | |
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But yes, it will cost more than a SC kit. |
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11-10-2014, 02:01 PM | #9 |
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This art. Wow
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11-10-2014, 02:41 PM | #12 |
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11-10-2014, 02:43 PM | #13 |
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11-10-2014, 03:42 PM | #15 |
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11-10-2014, 03:46 PM | #16 |
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Nice work Aleks
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11-10-2014, 04:39 PM | #19 |
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Your guys threads are absolutely some of the best and most informative on this site. I always look forward to reading them. This one in particular really is what I had hoped for. I still wish a fully decked out 4.6L would make more WHP on 94oct but it's not bad none the less. I really look forward to hearing it!
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11-10-2014, 05:50 PM | #20 | |
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There are ways to make more power but we may explore it on the next 4.6L build. Aleks. |
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11-10-2014, 06:06 PM | #21 |
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Great work Aleks!
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