I totally agree. Piston speeds at 8200rpm in a 2.3 liter stroker are ludicrous. Its like spinning a 2.0 liter 4G63 to almost 9200rpm. Talk about dramatically accelerated short block wear.

 

seriously...this guy spews nothing but crap...anyone with half a brain can figure out he's pulling stuff out of his you know where.

The consensus for a SAFE rev limit with LONGTERM reliability is 7500.

 

Balance shaft is still in there.

Scorke, are you saying that if I regularly shift at 7900-8000 rpm I'll have no long-term engine issues caused by excessive piston speed or rod stroke/angle induced side forces--e.g. warped piston bore?

 

Josh, keep the revs around 7500rpm on a daily basis if you want it to last.



We run our 2.4 to 9k without any problems, but we also don't recommend it on a daily basis.

 

It's always a good idea to ask whom built the engine for you what they suggest the limits to be.

Everyone will have slightly different margins, but you can't go wrong with 7500 on a street car.

 

Ya, we built the motor. We have been building a ton of 2.4's and 2.3's lately. I can't actually build them fast enough. I would suggest 7500rpm as a safe daily redline.

 

Yes! Now take that with a grain of salt because everyone will have a different view on what is "safe". Obviously I do not care to blow up my motor after spending close to 2k getting it built and buying the parts, however after talking to people at AMS, TopSpeed, TurboTrix they all seem to agree that right around 8 grand should not be detrimental to the life of the block. Now one thing to take into consideration, if you are interested is how much the shorter rod/stroke ratio and long stroke effect the amount of strain on your rotating assembly. I will do a search for a post made by either Ted B or SaabTuner regarding the relative amount of force your rods will go through depending on whether it is a 2.0 and 2.3 at various RPM's.

I run my car daily, on the road course, and everywhere in between. Daily, if I am driving very hard for some reason I shift at 7k, just because I feel there is no reason to wring my cars neck, unless I am racing, or at the strip. If and when I do take my car to the strip you can bet I will be screaming it to 8100 just to see what it runs. Also take into consideration that with the 2.3 your making a good amount more tq than a 2.0, so although you can rev that high, it isn't always substantially faster. I have taken my car to 8k numerous times, a week after it was built on its first dyno pull Doug took it to 8100 rpms. My face looked something like this when I saw it going past 7k on the dyno screen , however if you do some more research and ask people with 2.3's it seems this is a safe middleground between performance and longevity.

NOTE: I am stating all this information with only 3k miles or so on my own particular car/stroker kit. If you are running high quality intnerals that you trust, I would say rev to 8k as much as you like, Buschur and Al have ran theres over 9k,again I believe if a motor can survive short passes at over 1k rpms more than what I run on a non frequent basis, my motor should live a nice long healthy life, and yours should too!

Scorke

 

i'm sorry, i don't get this- you've got an RnR engine, an RnR turbo setup- why aren't you getting this info from RnR? shouldn't they be better informed to give you exact recommendations concerning the limits of this setup than any of the random "i read it on the boards" types who will chime in here?

not trying to be an a-hole, i just don't understand this mentality. help me out here.

what does RnR say about this? have you asked them? why would you trust any opinion you find here over theirs?

 

Gemini, as great as your post was for advising a good idea, if you read this thread you would see that this has already been done, IMHO there must be some reason why he is asking it on the boards instead of straight from the builder. Opinions are a lot like *******s everyone has one, some smell more than others....

Scorke

 

geminix3:

I know you're not being an a-hole but I'm not sure why you "don't understand this mentality." It's not a "mentality"--poor choice of words--it's a methodology for information gathering. I've already spoken to RnR in the past about this, but they're an opinion of one. Ryan gave his recommendation on this thread and I highly respect his opinion given his experience, but I'd like to hear from as many engine builders as possible. If I can do it here by spending a few minutes on the keyboard, why wouldn't I? That's one of the great things about the Internet.

It makes sense to ask for different recommendations on the board because very often you get input from a number of other experts like Buschur, AMS, Dynoflash, etc.

It's a matter of getting a larger sample to have a more statistically significant answer. Does that make it clearer?

 

Ryan:

Thanks for the input! I'll TRY to keep it at 7500, but I can't promise anything :-)

 

I am just glad to hear the car is absolutely flying with the RnR 2.3/35R set up. I can't wait until you get it fully tuned. Also get rid of that Cat please.

 

+1 million. It's amazing he hasnt destroyed more motors himself with his total lack of knowledge and common sense.

 

I wouldn't be worried with taking a 2.3/2.4 to 8000 daily if not every weekend. That's because I did it to 8300 every weekend on c16 for 9000 miles at 600whp w/o a problem and it still runs great to this day with 12,0000+ miles. (Of course this was on a 4g64/2.4L dsm, but I'm sure the rod ratios are very similar if not the same)

 

New quote.