I have a 331 with decent internals that's fairly new still. I'm wondering how high I can rev the engine. I have plenty of power at 6800rpm and that's what my rev limiter is set at. Can I go into the 7000 safely?
Max Rpm is kind if useless. You want to shift when it maxs out on power not when it hits the limits of the engine. On my old 347 setup I got best results shifting at 6200 then when i tried revving out to 6500 or so.
call the suplyer of you stroker kit and ask them how many rpms its rated for. then a dyno should show you when the motor starts to fall off on power. dont run the motor higher than the stroker kit manifacture says.
A good indicator is looking at the operating range of the cam. Like Ryan said, stay in the power band, just because it can wing to 7k doesn't mean you are making any more power there.
I am of the opinion that revving the engine way abv the pwr band is just unessessary wear&tear on the engine. It serves only to put you back in the oil pan, possibly, a lot sooner than you had planned.
I wouldnt go as far as saying max RPM is useless Ryan, hard to blanket statement that. What if he is hitting the rev limiter at the 1000 ft mark and bouncing off it until the mark? Would be nice to know if your just flat lining on the power after or if everything is haywire and ready to split. I am with bryant on this one, first contact you parts suppliers and here what they have to say, next get it on a dyno and see whats going on and whats happening. I will say this though.............. If its a stock block I would not want mine reving that high. I would be regrinding the cam for some longevity of the motor. Revs can kill a stock block pretty fast when making some decent power like you are.
I got it from CHP. Coast high performance is not the best place for info but I will contact them. I probably should put it on the dyno. I hope I will find out from CHP.
X 3 on this. Let it pull till you feel it quit, then shift. My 331 will rev to 7500 without problems, but it stops really accellerating the car at around 6500-6700. And this motor is 7 years old.
Not sure I follow what you are saying. But What i meant was it dosn't matter how far you can rev before you float a valve of blow it up because you should be shifting way before that. When it stops pulling and making power then shift. My engine may be able to rev to 8k but I got my tach redline set to 6200 becasue any higher is useless to me. Not the best place to get much from in my experience. I think my stroker crank always had an oil problem. And they took 2 weeks and 3 wrong shipments to get a correct piston after ordering some parts to fix the damage from a spum rod bearing. Each time I would send back the wrong piston and spiral locks. then I finally get the right piston and thats the time they didn't send it with the spiral locks. And they were a pain in the Ass to talk to. Look through the paper work for a cam card and info on the valve springs. that should give you an idea of how high it can rev. But get it on a dyno to see how high you should be revving it too. Or get some more seat time at the track and play with different shift points.
There are at least two red lines for any engine build; The first red line is where the cam allows the maximum power. The second red line is where the valves float and you mechanically lose power. A third red line is where the components fail due to inertial loads (pistons break, rods break, crank twists or breaks) leading to catastrophic failure.
mine will handle 7000 but I nose over on power about 5800, so I shift at 6000. I would imagine you'll stop making power before you will hurt the engine mechanically.
