Refresh951's Hybrid Stroker - Update: It is Running!!
I have been closely following Sid's (Blown944) build thread and I absolutely love his concept. I love the idea of developing reliable, large displacement motors at a reasonable cost. Therefore, I decided a while back to start collecting parts and doing the research to make an attempt at my own 2.9L build. Sid has graciously given me a great deal of advice and I appreciate his assistance. I am close to assembling the motor as I am only waiting on the crank. This motor will be used mostly for street use with occasional track days. I have had a couple people tell me I am crazy to try this. I enjoy a good challenge and if I fail (and I do not plan to fail) it is my time and my money. Either way it will be a great learning experience for me. I have had an absolute blast so far working on this. I have some very high goals for the build:
- 400 rwhp/400 ftlbs torque at 6200rpm - Near k26/6 bottom end performance - Total cost under $4200 for everything, including my "High Flow" head - Using 86 Block, dry sleeved, bored to just over 102mm, windage ports added, half filled - JE Small Block Chevy Pistons, Forged 4032 - Eagle 150mm Mitsubishi Rods - 86 2.5L crank, offset grind, 86mm stroke, cross drilled - Compression Ratio is 8.1:1 - ARP Head Studs - Cometic Head Gasket - ACL Race Rod Bearings - Crank Scrapper - Stock Cam (still researching options) - MoCal 13 Row Oil Cooler, 235 mm My current 2.5L motor is running great but after the Concours this weekend I will be pulling it out of my car to install the new motor. I will be re-using a lot of stuff from the 2.5L to keep costs down (turbo, M Tune, water pump, cam tower, ect.). http://www.refresh951.com/Build1.jpg http://www.refresh951.com/Build2.jpg http://www.refresh951.com/Build3.jpg http://www.refresh951.com/Build4.jpg |
Awesome - I too am dreaming of this, but the $$$ just isn't there yet.
That said, how much material did you have to bore out to fit the 102mm sleeve? I measured the other day and the cylinder walls are between 8 and 9mm thick (seems to vary a bit depending where on each cylinder you measure, but I guess if the hole center is right then it's OK). The intertube says the (dry) LS1 cylinder liners are only about 1.5mm thick. A 102mm bore with that thickness means 105mm hole in the aluminum. That still leaves ~5.5mm (~0.22") aluminum wall...how big can we go and stay with a dry liner? |
Right on!!!
Remember, you may need to fly cut the pistons slightly for a fully non-interference fit. I'm looking forward yo seeming it get done and your comparison dynos as well. I'm sure you'll love it. |
This is awesome... though I gotta say, I was a fan of your stock-ish setup! :) Your existing 2.5L (w/T04) is pretty much what I want to do with mine....
Good luck - will watch this closely! |
Why not 9:1 compression? I would think this would really help with low end performance. Very cool to see yet another stroker motor. I need to learn how to build motors. 2 Strokes are not a huge problem 4 strokes with these valves just trip me up. Hehe
Good Luck! |
Originally Posted by blown 944
(Post 9619821)
Right on!!!
Remember, you may need to fly cut the pistons slightly for a fully non-interference fit. I'm looking forward yo seeming it get done and your comparison dynos as well. I'm sure you'll love it. I should be "claying" the valve clearance this weekend then I will know exactly what I have. |
Originally Posted by OmniGLH
(Post 9619863)
This is awesome... though I gotta say, I was a fan of your stock-ish setup! :) Your existing 2.5L (w/T04) is pretty much what I want to do with mine....
Good luck - will watch this closely! |
Originally Posted by 86 951 Driver
(Post 9619871)
Why not 9:1 compression? I would think this would really help with low end performance. Very cool to see yet another stroker motor. I need to learn how to build motors. 2 Strokes are not a huge problem 4 strokes with these valves just trip me up. Hehe
Good Luck! |
Awesome Shawn. Your car was already pretty incredible, nice to see more people trying this. If my motor ends up having issues, I think I will attempt this as well.
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Awesome Shawn!
Any pics of the windage ports? Regarding compression, the stroker motor will have so much more bottom-end grunt, keeping CR around 8.0 isn't an issue - it will help keep peak cylinder pressure down and be less likely to knock. |
Originally Posted by robstah
(Post 9619934)
But more cylinder pressure = more torque. :p
What kills these engines is the peak. Extending cylinder pressure duration, but at a lower peak will also accomplish the same end-goal (more power/tq). Regardless, I just had one of my own threads dragged way off due to an irrelevant contention, lets not do this to Shawn's thread. |
Knock schmock he's running E85 already...
I wish that stuff was readily available here! |
Could this theoretically be done with a 3 liter crankshaft in conjunction with MID sleeves to make some stupid 3.2L+ setup?
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Originally Posted by V2Rocket_aka944
(Post 9619756)
.how big can we go and stay with a dry liner?
Very cool project :rockon: |
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