Anyone know the safe rev limit for a 2.5 stroker running dry sump, JE pistons, lightened and balanced crank and titanium rods etc??
Jay
Jay
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Theoretically it is 7k, you could take it to 7.3-7.5k but I wouldn't take any higher
Dry sump or not.
Pisobiker has a thread with the calculation on. ( search for stroker and it's not the sticky thread think it's called stroker or not stroker )
What length rods 156mm or 159mm?
I'm going to be using the standard 7.3k limit but wont go above 7k -
Thought you might have an answer lol
7500rpm at a push isnt enough for me want 8000rpm!
Might stick to the 2.2L or put in the 034 crank for 2.45L and rev it to hell.. 9000rpm
JayComment
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8K rpm is more like it. Thats a tall block 95.5mm stroke with a 1.65:1 rod ratio keeping you arround the safe maximum of 25m/second piston speed.Comment
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Stroker wont go that high tall block or not mate not. Spoken to a few people over the stroker rev limit.
Jay the 92.8 crank will only rev to 7500 read the thread on motorgeeksComment
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no prob to rev it 8 k with dieselcrank( you does not have over 25m/s pistonspeed either).... BUT with 8 k i will rekomend drysump and mek pushers for the cam....
if you have the 92,8 crank it will be 8500 max limit with 25m/ s.....Comment
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Its all about rod ratio and average piston spped. Its only simple physics. 25m/s is arround the max you want and 8K rpm with a 95.5 mm stroke just passes. You do need the tall block and longer rods. The longer 158mm rods keeps the same rod ratio as a stock aan etc engine.... All the info on the first motor geek thread is for shprth 144mm rods and short blocks.Comment
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It depends what kind of Stroker.
As the Enthousiast
before me said, it depends! Tell us what crankshaft and what rod length.
Last edited by Billman; 10 June 2007, 21:28.Go Holset or Go RS4Comment
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Nothing been bought, so you can tell me what rods, crank and block combo would push the rev limit but minimise bearing/piston/ring pressures
JayComment
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i would stay std, but modified bottom end, with dry sump, solid lifters and then rev it to 8.5k. ideal for larger turbos like the gt35/40r or biggersigpic
Tom C - www.rcmr.co.uk
Audi UR Quattro
Audi 100 C3 2.0 5 cyl 115ps
Audi S2 - 07k engine project aiming for 800ps
Audi B5 RS4 645ps 911nmComment
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7A botom end, 92.8 crank, bore to 82.75 and mechanical top end. But i am biased.:mischeif:Carlos.
On the look out for less bits for my s2 saloon project. Now supporting myself by shooting for my food. www.airgunforum.co.ukComment
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