Are you guys still not willing to raise the rev limit to 8k? And also is it possible to get your flash with just the rev limit raised and the speed limiter removed. No fuel trimming or changes in ignition advance?

Thanks

 

Just curious but why do this? I mean, if you are not getting any additional power from air fuel changes, then what is the point of a higher rev limit? Like I said, I am just curious...

 

My car is a turbo only convereted cooper s. I have a piggy back to do the fuel trimming and control the ignition advance. And with a higher rev limit I won't be hitting the rev limiter in third at the end of the 1/8th mile (90 mph).

 

I do what ever you like; 8000 is fine. Just get in touch with me.
I am assuming you have solid tappets and racing rockers as this is the issue you will be dealing with.

 

8 grand is SEXY... i want a 8,ooo rpm red line

 

Thanks for the explanation. Looks like Don is willing to help.

 

Let me go at this answer again. I might do it and if I do it will come with no guarantee what-so-ever. I do not recommend higher than 7750 rpm for any Mini due to the limiting factor of the hydraulic lifters. Not only that but the rockers are not designed for that rpm and depending on valve weight they might float. Thus, do not expect higher than 7200 rpm limit from me or MTH.

 

I would think that a no guarantee would be expected. I mean, this is way out of spec which is why I was so curious in the first place.

 

What about switching to mechanical lifters? Wouldn't that also free up some power? This would obviously be for race purposes since you would need to adjust them ever couple thousand miles.

-Brian

 

Rev it up! But you will be bound by the weight of the intake valves and the rockers strength.

 

How high do you think it will go?

 

I imagine that it all depends on the weight of the valve train and the IAT generated by the supercharger among other factors. I've never revved them more than 7800.

 

Perhaps I am missing something here, but where on a nonpushrod engine are the lifters? I thought that the rocker arm / cam lobes acted as said devices on an OHC engine.

 

This is a good explination on what they are and why we have them. Ever heard a brand new cylinder head start up? Sounds like a train reck in your engine.

-Brian

 

I am familiar lifters and why they are needed, my familiarity though is with old pushrod v8's such as 5.0l fords and such, where they would ride the cam to push the rod to actuate the rocker arm. In fact I have retrofited roller lifters to said motors to run roller cams.

In our case it looks as if you have the rocker arm which rides the cam lobes which acts as both lifter and rocker arm. Anyone got a pic? I am familiar with the rest of the valvetrain on our cars, but maybe I just have my terminolgy confused...

To me the orange piece the red arrow is the lifter, albiet under the rocker arm, the green arrow is pointing to could be considered the roller rocker or could be part of the "roller" lifter. Correct me if I am wrong...