Rev limit

[timg]

If power is still increasing or holding steady, is there anything to prevent you from extending the rev limit to 7000 rpm or more. I understand that the valves can float, but that should affect power more than safety of the motor. Are there any durability/safety reasons to keep the RPM's down? I'm thinking about building a motor and upgrading my turbo and am wondering how high I would be able to rev before running into issues. Thanks.

Tim

BTW- all of these plans are still 6 months or more off. I'm working on gathering parts and I'm making plans as I go. I'm only home one weekend a month so my schedules tend to be in months, not weeks.

[SappySE107]

You can spin it to 8 if you have the right parts. Depends on what you are doing for your build to help it last. Your lifters may not work to 8k and the oil pump might want to suck the pan dry, but I don't have any idea how to test for that other than doing it.

[farmerz24]

3x00 pan swap (with mains ) gets you the oil level sensor which you could monitor or even put an auidible alarm on it so you could see after doing a long top gear pull, and apparently with a external oil cooler the capacity is increased. you could also deepen/widen the 3x00 pan (or your stock pan) to increase the capacity. baffle it with custom aluminum baffles while your in there. I would think this would work. I am going to the bigger pan/external cooler setup on my 3400 build. i am revving to 6500 right now, 7500 would be nice which is what i plan on the next build, i guess i will ues a new dohc pump as my pump setup unless you can reccomend a better alternative?

but id do that or even try to mod the pan to fit the 3x00 low level sensor.

[Fiero Brick]

An oil accumulator/accusump system wouldn't hurt and would be a great insurance policy against oil starvation for any reason. It isn't expensive compared to a dry sump system or a new engine, either.

[Ortie666]

well it does look like you all know that oil is the problem the higher you rev... prolly one of the best tricks i know of is a good pollish job on the crank making it just on or slightly under the low side of the the listed crank size. Oil coolers, baffles, scrapers, windage trays, and extarnal pumps all help with the higher you rev, but lets not forget about a good ballence job kuss if there is one rod/piston that is not happy, it may slap around once its really movin.. and that cyl will be the one really movin a bearing first... other then those recomendations 8 G's should be accomplished with no sweat

[gpse3400]

There wasa time I used to wind my 3400 to 7200 on a 1-2 shift till Ben was logging my car and pulled it down to 7000. Alittle too high, as power was dropping after like 6700. You can wind that high without any oiling problems, just don't use an HV pump as that will cause main and rod wear and pump drive wear. Yeah a good scraping system and proper clearences and a stock oil pump and you can take it pretty high.Balacing is agood too but not a must. My setup never was. But the skys the limit if you do.

[ThirtyTwo]

Well I dont think the piston would smack a valve if valve float occurred since its a non-interference engine but the intake valves could get tangled up with the exhaust valves.