dogsballs

After recent tuning events on my high comp 12.0:1 E85 running L76, its still making hp to 6900rpm. albeit my fuel injectors are maxed out at the moment. any feedback from GenIV owners spinning stock bottom ends over 7k?

redtan

iTrader: (5)

Yeah upgrade it? Maybe some rod bolts at the very least.

What heads are you running for that high compression?

Tainted

iTrader: (9)

rod bolts for sure, typical valvetrain upgrades; oil pump, pushrods, rockers (at least the trunion upgrade) , springs, valves. all of that is very critical to high rpm stability

branj70

ARP rod bolts and what Tainted said

hellbents10

iTrader: (10)

I have yet to see a spun rod bearing or failure on a 2001 up rod bolt? Am I missing something here? This interwebs rod bolt stuff is getting out of control. If he was asking about spinning his 98' LS1 that high I would agree though.

With that being said the biggest issue at or above 7000rpm is the factory oiling system.

redtan

iTrader: (5)

Are you serious? So you're saying that NOT ONE SINGLE ls engine built after the year 2001 has spun a rod bearing?

Tainted

iTrader: (9)

Even if there arent many rod bolt failures, its still a critical piece thats not expensive and offers just that much more peace of mind. If youre willing to do a heads/cam type deal then doing rod bolts isnt much more of a stretch

1lejohn

iTrader: (9)

Damn I wasted a lot of cash on my junk. HotRod did do a test on the little 4.8 that they built it made obcene power under boost . Like they stated it all depends if you don't mind driving over you bottom end at the 1000ft mark its all good.

hellbents10

iTrader: (10)

Oh did hot rod magazine run that engine down the track lol?!!!!!!!!

Oh wait that was not a question, that was a statement hiddin in a question. They did not run it down the track.

I speak from actual experiance and I have made over 800rwhp on at least 5 more stock bottom end gen3 and 4 engines then you. I say 5 beacuse that is how many I have tuned at that level. I know from actual experiance that they will bend rods at 900rwhp if you race them on the track and not just on the dyno.

BTW we have 4 engine dynos and 1 chassis dyno here, interwebs knowladge may not be as keen as yours though.

1lejohn

iTrader: (9)

It was a fooking joke. I never said that you couldn't do it. How durable are they?

I can't even get down the track with 5-700 hp with out tearing **** up. Friday night the fly wheel let go and took out the starter gear and blew a hole in the bell housing.

3pedals

iTrader: (3)

whats your opinion on OEM gen IV rod bolts at 8000 RPM and under(iron 6.0).

dogsballs

stock L92 heads were decked 100thou to get compression up to ~12.0:1, PTV is good as i'm running a stock LS2 cam (with valve springs, LS7 lifters, pushrods), just for ***** and giggles (ultimate budget build). yeah ARP bolts are easy to do, but as been mentioned, very little to no feedback on people killing rods or rod-bolts on a GenIV.

few fellow aussie drag racers have spun regularly to 7000-7200 stock. curious who overhere has done it.

3pedals

iTrader: (3)

I have turned 7200 on every shift down the track for 2 seasons - over 70 passes, no issues. I want to turn the wick up and wind it to 8000. Id like to hear about anyone doing this with oem rodbolts and how long they have been doing it.

litle88

iTrader: (20)

Are you still making power at 8k? I seriously doubt it.

Or do you want to spin it to 8k for the hell of it?

If your not then why bother?

dogsballs

i know of someone with a stupid size cam with a 6000 convertor who spun his to 7800 (with ARP rod bolts), this was for a bit of run-out off top of peak power.

3 pedals, thanks for feedback.

1badeagle

iTrader: (9)

I'm going to shift my car at 7600 and 3 pedals has a bigger cam than me.

3pedals

iTrader: (3)

Instead of making assumptions, and posting DICK replys, maybe consider that there are some changes happening to my combo

1lejohn

iTrader: (9)

With the stock 92 heads what intake are you going to run??

3pedals

iTrader: (3)

Vic Jr here

hellbents10

iTrader: (10)

A good pan and pump, and proper oil restriction to the top end will help keep it alive above 7000rpm. Myself I do not see to many stock bottom ends around here going over 7200.