dr_hunt Posted May 26, 2005 Share Posted May 26, 2005 The z had a 250/260 duration at .050, .600/.625 lift crane roller with 108LSA. Was good for 11.29 @ 122mph. Kind of a mild roller so I thought I'd try something different. Just bought a crower roller part number 00439 282/286 duration at .050, .672/.687 lift on a 108LSA. Supposed to be mid to top end on a 350 with automatic trans. Also trans brake should be in next week sometime, so I'll do both installs at the same time. What do you think? Quote Link to comment Share on other sites More sharing options...
jbk240z Posted May 26, 2005 Share Posted May 26, 2005 Hmmmmm, I think you had better hold on tightly, it's gonna be a wild ride! I think I would prefer the smaler cam for a turbo set-up though. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted May 26, 2005 Author Share Posted May 26, 2005 the turbo motor is a completely different engine on the stand, this cam is for the alcohol 358 that is in there now, which I'm going to play with now while I sort out the turbo/alky issues. I'm having alot of trouble getting information from the manufacturers about turbocharging a blow through alcohol system, including conflicting ideas about compression limits. Procharger people say 13:1 is ideal for their system up to 30psi, turbo people say 9.5:1 max for their turbo system up to 20psi. 9.5:1 engines on alky are hard to start even in the summer on cool nights without gas priming to initially light it off. Raises all kinds of issues on how to accomplish that. On blown alcohol engines with roots blowers I've always gone with 12:1 and run as much as 22% overdrive, so I'm not seeing the difference, here, boost is boost, no matter how it's generated. I can see cams playing a larger role in turbo motors. Cam people have given differing opinions on cam selection as well, some like it large, some think small is the way to go. Quote Link to comment Share on other sites More sharing options...
jap tin Posted May 26, 2005 Share Posted May 26, 2005 What kind of rpm are you going through the top end now? How about converter? Are you installing the cam on the intake centerline at 108? what kind of cranking compression did you have with the smaller cam? Cylinder heads? Just trying to get a feel for things here. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted May 27, 2005 Author Share Posted May 27, 2005 Goes through the lights at 6500 with the 4.56 gears now if you run it all the way out. I've been shutting it down at the first cone at the traps for bracket races and it'll run a 11.35 @ 113 just about every time doing that, was very successfull and made it to the quarter finals out of 60 cars. The converter is a 4500 stall, but since the transbrake just showed up today all I've been doing is footbraking at the lights leaving at 2000 rpm. I prefer the Torco converter in my other car alot more in relation to this one, but we'll see how that shapes up with the transbrake. The cam it has in it now was installed on the intake centerline at 106. Never checked cranking compression on it yet. Heads are CNC AFR220's, 2.08 intakes, 1.6 exhausts, 66 cc chambers. Hooks real well, goes real straight, no bobbles, no wobbles, easy to drive. Quote Link to comment Share on other sites More sharing options...
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