CJ Posted September 28, 2005 Author Share Posted September 28, 2005 It's the absolute piston acceleration that is the problem, a few millimetres too much stroke and it goes over the edge, into the 'dark side' Sorry for my ignorance but can you explain what that means John? In relatively simple terms if possible Link to comment Share on other sites More sharing options...
attilauk Posted September 28, 2005 Share Posted September 28, 2005 the stock stroke length for all Type 1 VW engines is 69mm the big drag boys in the states and down under run 90+mm stroke engines Link to comment Share on other sites More sharing options...
JohnA Posted September 28, 2005 Share Posted September 28, 2005 Sorry for my ignorance but can you explain what that means John? In relatively simple terms if possible it is metres/second square (m/s2) of the end of the rod at full extension at full revs. It is metallurgy that defines this limit, and it hasn't moved dramatically in the last decade or two. Another way to look at it is piston velocity: 18-20m/sec is the limit for 'normal' cars now Kick-ass revving cars (S2000, M3 etc) push this up to 23-24m/sec Formula1 pushes it to 26m/sec. You get the picture. So we have to strike a balance between long-stroke/low revs or short-stroke/high revs. Can't have both. Link to comment Share on other sites More sharing options...
Jake Posted September 28, 2005 Share Posted September 28, 2005 the stock stroke length for all Type 1 VW engines is 69mm the big drag boys in the states and down under run 90+mm stroke engines Holy crap! Not on the standard block surely? There can't be 10mm squish gap on the VW stock motor, can there? Link to comment Share on other sites More sharing options...
terawua Posted September 28, 2005 Share Posted September 28, 2005 From my karting days, I remeber that there was a few manufacturers who offered a long and a short stroke version of their engines.... I think a karting forum would be a good place to look for info, or just ask people who know more than me.... Link to comment Share on other sites More sharing options...
terawua Posted September 28, 2005 Share Posted September 28, 2005 From my karting days, .. then I got too tall and lardy...10kg over weight limit with no ballast! (last race- San Diego Calif, 1997) Link to comment Share on other sites More sharing options...
JohnA Posted September 28, 2005 Share Posted September 28, 2005 http://www.max-boost.co.uk/stuff/biker.jpg http://www.max-boost.co.uk/stuff/pocketbike2.jpg Link to comment Share on other sites More sharing options...
MONKEYmark Posted September 28, 2005 Share Posted September 28, 2005 aint leon one who has/had a stroked engine. also dj craig has one too.i thought it was you could run more power on less boost with a stroker kit. if you going that far i think you would be better off with a chevy v8 they have huge amount of torque low down. more easy to buy tuning parts for too. you can even buy a viper v10 engine if you wanted to be different. Link to comment Share on other sites More sharing options...
JohnA Posted September 28, 2005 Share Posted September 28, 2005 I agree with Mark. If you wanna go big, do it properly. What is it with skylines pushed from 2.6 up to 2.8 or supras from 3.0 to 3.3. All this mess for 200-300 lousy ccs? A chevvy v8 is so much cheaper and bigger too, excellent base for a torque-monster with nice top end. Never had the pleasure of driving a Viper, but a massive V10 won't be too bad a base for a turbo project. The supra is a well-balanced middleweight at 3 litres, why mess with it? Link to comment Share on other sites More sharing options...
Digsy Posted September 28, 2005 Share Posted September 28, 2005 Holy crap! Not on the standard block surely? There can't be 10mm squish gap on the VW stock motor, can there? You use a shorter rod to compansate, Jake. At TDC the piston will be in the same place. Mind you, I'm more surprised that the skirt isn't hanging out of the bottom of the bore at BDC and the big end isn't chewing its way through the sides of the block at stock +10mm crank throw. Link to comment Share on other sites More sharing options...
TLicense Posted September 28, 2005 Share Posted September 28, 2005 I'll let you all into a little secret... I've just started collating parts for a high revving (circa 9K) very large single turbo project for my JDM TT. (Inconel exhaust valves anyone?) I'm intending to basically drive the car about 500rpm higher than usual, aided by lower final ratio, to combat lag, and then use extra revs on the top end to stop me from having to change gear just as the blower really kicks in. I won't be buzzing it to 9K all the time, will probably limit it to the occasional drag race/track event. 8000 - 82000 RPM will be a more day to day rev limit. I figure as long as it get's a good yearly inspection, and the real high rev limits are errmmm limited, then I should be able to catch any reliability issues before it becomes a catastrophic event. Link to comment Share on other sites More sharing options...
Class One Posted September 28, 2005 Share Posted September 28, 2005 . 8000 - 82000 RPM. Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 28, 2005 Share Posted September 28, 2005 Sounds good Tony... 82000rpm, you have learned a few tricks in the F1 game Gaz. Link to comment Share on other sites More sharing options...
Steve Posted September 28, 2005 Share Posted September 28, 2005 Sounds good Tony... 82000rpm, you have learned a few tricks in the F1 game Gaz. Link to comment Share on other sites More sharing options...
TLicense Posted September 28, 2005 Share Posted September 28, 2005 Well if you're not pushing, what's the point of trying Cheeky git. Link to comment Share on other sites More sharing options...
Ian C Posted September 28, 2005 Share Posted September 28, 2005 Always always always check for typos when you type in speed or revs figures Or you get this, the "sarkygit effect". -Ian Link to comment Share on other sites More sharing options...
attilauk Posted September 29, 2005 Share Posted September 29, 2005 You use a shorter rod to compansate, Jake. At TDC the piston will be in the same place. Mind you, I'm more surprised that the skirt isn't hanging out of the bottom of the bore at BDC and the big end isn't chewing its way through the sides of the block at stock +10mm crank throw. they use longer cylinders too (all 4 of the Type 1's cylinders are all seperate and you can "bolt on" larger ones) the stock crank case is a very strong unit and can be clearanced to run a 90mm crank but with the money it costs to build such a radical engine most people tend to use an uprated case like a Pauter unit (based on stock castings but reinforced around the main bearing) Link to comment Share on other sites More sharing options...
Nick Posted September 29, 2005 Share Posted September 29, 2005 When I was last at Arnouts he had a 2JZ-GTE VVT-i sat in the corner with a large single and a Supercharger. I think he's puting his stroker kit and VVT-I cams in there too, should be interesting Link to comment Share on other sites More sharing options...
Digsy Posted September 29, 2005 Share Posted September 29, 2005 they use longer cylinders too (all 4 of the Type 1's cylinders are all seperate and you can "bolt on" larger ones) Like slip-fit liners? I see. Link to comment Share on other sites More sharing options...
attilauk Posted September 29, 2005 Share Posted September 29, 2005 yeah thats right Link to comment Share on other sites More sharing options...
CJ Posted September 29, 2005 Author Share Posted September 29, 2005 For me, this thread typifies all that is good about MKIVSupra.net. I asked a question and have been able to read replies that have really helped me understand yet another aspect of the engine and its workings. Not only that, no one talked down to me, lectured me or took the piss at my lack of knowledge. People, I Link to comment Share on other sites More sharing options...
Class One Posted September 29, 2005 Share Posted September 29, 2005 Not only that, no one talked down to me, lectured me or took the piss at my lack of knowledge. People, I It can be arranged !!! Link to comment Share on other sites More sharing options...
JohnA Posted September 29, 2005 Share Posted September 29, 2005 For me, this thread typifies all that is good about MKIVSupra.net.....no one talked down to me, lectured me or took the piss at my lack of knowledge. OK, enough of this charade, let's all really be ourselves, eh? Link to comment Share on other sites More sharing options...
Nic Posted September 29, 2005 Share Posted September 29, 2005 Not only that, no one talked down to me, lectured me or took the piss at my lack of knowledge. CJ's technical car knowledge Link to comment Share on other sites More sharing options...
Nic Posted September 29, 2005 Share Posted September 29, 2005 Not only that, no one talked down to me, lectured me or took the piss at my lack of knowledge. CJ's technical car knowledge Link to comment Share on other sites More sharing options...
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