Most of the custom Tuned mini's gets an extended rev limiter, mine is at 7200rpm. Will this kill the engine revving it till down there ?
When you race do you actually shift at the point just before it cuts out or a few hundreds of RPM before the limit?

 

In a short answer no it will not kill the engine.
Is it the best thing for it spinning 7200 steady state?
thats up to you. think about the forces at work in your engine
you have 4 pistons that are stopping and starting at the bottom and top of the stroke 7200 times a minute or 120 times a second.
Opperation at this speed? probably not the best
every once in a while why not.

 

It will not kill the engine and you can not over-rev the engine using the throttle as it is electronically limited. You CAN over-rev by downshifting to the wrong gear, like 5th to 2nd.

On track, you will typically shift just under or at the rev limit, depending on the car. Some cars fall flat at that high RPM, others really scream.

 

If you get a tune take a close look at the tq graph. That will tell you at what rpm to shift at for the best power. You want to make sure and shift at a point that is just at the meat of the next gears tq curve.

 

Mine Gernaded a few years ago (spun rod bearing) on the track with essentially stock everything and just a pulley. But 96k on the clock and stock 5w-30 oil. Everything will let go eventually. The question I'd ask is... has anyone lost a stock motor (internal failure, not a tuning issue)? If so how many miles and what RPM where you spinning to?

 

When I shift the log shows 8800rpm for a split secound, total stock bottom end which has done 70k and has been abused most days since Nov 07.

I was okay until Thomas reminded me last weekend its got stock rod bolts still in it, and for some unknown reason I thought it had ARP.

I just think I'm lucky

 

Your drag racing as well so it's relatively short bursts on the motor and oil temps are a bit less of a concern. The LS1 guys are shifting at 9k or something crazy like that in the drag cars. No way you'd ever run them that high on a race track or a multi mile highway pull.

 

Yeah you're right there but if we could measure the force on the rods with 140hp of nitrous on top ................

Also its seen track duty on a 4.2 mile track over here, I believe its done 4 or 5 days in total, I day it done 2 tanks in one day.

It wll be back there for winter time as the strip is closed and you've got to have fun somewhere, I believe we were at the track on boxing day last year.

On another note I have sold engines to the Challange guys over here where they have kicked a rod out but thats rent a drive where I presume they really dont care :(

P.S I enjoyed your last video

 

The mini motor can see 10k rpms. The internals have to be built for it though (valvetrain, con-rods, knife edged crank)

 

If you really want to talk about rpm, I have a good friend that runs super stock dirt cars and his car makes about 650hp on alcohol, dry sump oil system, and 2 speed manual (one gear for pits and one for racing). the car runs up to 9500 down the straights and no less than 7500 through the turns, but can turn almost 11,000. The engine is a 355 (350 .060 over) with scat crank, stock 400 rods with arp hardware, and forged pistons. I realize that this car is a little extreme compared to a street driven mini but just gives you an idea what can be done with the right parts.

 

Ever watch NASCAR.... 10k plus for hours in those old push rod things. It's amazing what some good ole engineering can do. 800+ hp out of those little carbs (I think the run 650's). That's just amazing to me.

 

When these things let go are we seeing Rod's snapping or bearing failures? Mine was a bearing failure.

 

this makes me want my rev limit rasied!

 

10K in NASCAR? I admittedly don't watch it but I do know someone who did quite a bit of work on those engines and they were topping out around 7500 rpm.

 

Pushrod 90* cross plane crank V8's (NASCAR or any domestic pushrod v8 ) can't go to 10k as the push rods will explode from the extreme 2nd order harmonics at 10k rpms. Now if your talking about small displacement short stroke(2inches&below) 180* flat plane crank V8 (layman's terms two 4 cylinder engines sharing the same crank at 90* piston angle or 72* piston angle) great example are F1 motors they can literally sing God Save the Queen at 20k rpms. Also the MINI motor has a 180* flat plane crank.

 

get what you guys are saying. Why did mini themselves not raise the limit, but limit the car off rather at around 6850?

 

Watch the Incar with data, I don't watch NASCAR but have watched it on occasion, Driving a GT2 around daytona in the One Lap this year at near 180 mph gave me a bit more respect for what they do at near 200. But when whatever particular television station puts up the incar telemetry for them at some of the tracks the cars are hitting upwards of 10k. It's MIGHTY impressive. Either that or the Telemetry for TV is Lying.

 

I stand corrected on NASCAR they do infact have a 10,000 rev-limiter. Cup engines made peak power of about 820-830 BHP at about 9000 RPM, and peak torque of about 520 lb-ft at about 7500 RPM.

What kind of motor was the GT2 car powered by a pushrod v8, SOHC V8, or DOHC V8. If remember correctly the C6.R GT2 Vette is the only one still using a push rod.

 

Sorry, 911 GT2... Street car. Zero Saftey Gear, Street tires (michelin PS2's), No downforce 179.2 mph. Gave me a lot of respect for the ole stock car boys doing 200mph. The difference between 160 and 179 on the banking was absolutely astounding. I did 160 on the warm up lap brainlessly, 179 took some brass ***** to keep it flat all the way around over the bumps.
Video...
http://www.youtube.com/watch?v=LBHmmOvWDHo
Data...

Car...

 

Very nice looks like that car was quite the drive

 

Nice driving!