I was wondering how far everyone reved their stroker because my dad and his buddies are old school and they think that if I go 383 then I should set my rev limiter at 5k.......YEA RIGHT I'm going with an eagle forged crank, eagle forged H beam rods and forged pistons. Oh and they think I should stop runnin nitrous to.....

 

Well i blew my 383 stroker at 7,800 rpm, so i really dont know, just some input for ya

wow i meant 5,800, sorry typo

 

383/396 might be large to us LT1 guys, but its not that big in the sbc world. 7k is not that high. My shift light is set at 6800. I shift around 68-69 only because of the stock pcm limitations. My mph goesup bigtime when I rev it up...

However, it all depends on your heads and mainly your cam. You need much more duration to shift at 7k than most of the Cz28 community thinks . 230º won't cut it.

Ryan

 

FYI: Your builder should have a good idea of where you motor should be rev'd to.

Ryan

 

My heads flow about 280 cfm at .600 and I have a 306 cam. and I only plan on reving it to about 6500 or so. Also how long has eveyone's engine lasted a X amount of rpm's

 

How high you need to rev it will depend primarily on the heads and cam. The stock PCM willl limit you to 7K regardless. But mechanically speaking, with the appropriate parts selection, the upper limit is very high. Certainly there are drag motors running 8,500rpm+ on up to 10,000rpm. However, the wear/breakage/maintainence factor goes way up once you start going past ~7,500rpm or so. A decent rule of thumb is to limit average piston speed to ~4,000fpm for a motor you expect to last a really long time. With a 3.75" stroke this is ~6,500rpm. Brief forays to ~4,500fpm (~7,300rpm) are ok with good parts and assembly. Once you start to hit 5,000fpm and beyond (~8,000rpm) you better be prepared to use premium parts and perform frequent inspections.

Once you start to get into the upper range of piston speed, this is where light parts play a big role in limiting the forces on the rotating assy. Long rods are of some benefit here as they will decrease maximum piston acceleration to some degree. With a 5.7" rod and a 3.75" stroke max piston acceleration is 4,500g at 8,000rpm. With a 6.4" rod this decreases to 4,400g. Not a huge difference, but at this level every little bit can help. Of course, the main advantage of long rods in a high rpm motor is the lighter piston, which decreases the force on the rod big end at TDC.

Rich

 

I didn't think with the rotating ***. I'm goin with that 6500 rpm would be a problem. THey think that it will blow up at anything over 5K. And I think it will just laugh at my little 125 shot now.

 

I spin mine to 7k. My PCM craps out at ~7.2k.

 

Considering your cam, Id say anywhere between 64-6600rpm, just depends on how the car reacts, supporting mods,etc.

 

My setup cuts the nitrous off at 7,000rpm, and has the rev limiter set at 7,200rpm.