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B234 - 16 valve revs?
- Thread starter dkrause
- Start date
GTJordan
Been here for too long
- Joined
- Jul 6, 2002
- Location
- Edmonton AB
For the SloVO?!
- Joined
- Dec 25, 2002
- Location
- mont, AL
it's relative to a number of things. stock intake manifold? I probably wouldn't turn it up much past 7k cause it's already choking at that point.
Currently I turn the gold car out to about 8100 or so. may experiment with raising that number, because the power keeps going up.. but... it's not exactly stock either.
Currently I turn the gold car out to about 8100 or so. may experiment with raising that number, because the power keeps going up.. but... it's not exactly stock either.
poulrais
Well-known member
- Joined
- Sep 8, 2006
- Location
- Quebec, CAN
Understatement of the year?
I think you'd probably want some stiffer springs if you want to go much above the stock redline.
With some mild NA cams and slightly stiffer valve springs they willingly rev past 8k without any issues. I never used a completely stock intake, so I can’t comment on the choke point on that.
I know Harlard is looking to go to about 8500 rpm with his 16v turbo, as it just keeps making power as Kenny mentioned.
I know Harlard is looking to go to about 8500 rpm with his 16v turbo, as it just keeps making power as Kenny mentioned.
dl242gt
The world of the smiling Dogo
- Joined
- Jun 21, 2002
- Location
- S NJ, a suburb of Phila.
Another issue with revs much above about 7.5k or so is gonna be the accessories. The water pump, power steering don't like being revved too high all the time.
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100% correct. If the engine is going to see sustained revs over ~5k, then an underdrive crank pulley is needed. Your PS pump will thank you.
- Joined
- Dec 25, 2002
- Location
- mont, AL
it's just got manifolds, intercooler, turbo, cams, springs, retainers, 'street port' job on the head, and H-beam stock replacement rods... it's still got OEM NA pistons and all that. Your big limiter to turning rpms is the relatively awful intake manifold and restrictive port inlet on the head.. you can open up (on the car head) just the first couple of inches before the divider and probably pick up a fairly significant amount of flow potential without really greatly changing how it behaves. I've turned stock cams past 7k with just springs and a better intake coupled with that level of "porting" (really more like gasket matching to a larger runner intake manifold) and they don't fall off nearly as bad.. this was on a turbo car though, so YMMV I reckon
oh yeah, don't have PS on the gold car. This, and the alleged water pump cavitation situation should be considered if one is going to be roadracing at high rpms
The factory redline is 6500rpm from what I remember. We ran one in the General Leif a couple years and I expect we ran it up to 6800. It was all stock with a shortened intake manifold and removed balance shafts. People have said that the stock valve springs aren't good for anything other than stock revs and camshafts.
The stock bottom end, once balanced, is fine to higher rpm. Erland says he recommends a 7,000rpm max for the stock balancer. We are keeping our cap at 7,000rpm with the 8V now as we don't want to run into issues with the lightened factory harmonic balancer, valvetrain, transmission and/or water pump. Hah