Bottom End requirments for high reving engines
Turbo Mini Forums

starting to get a bit edgey with my new engine, and thinking I should have uprated some of the components in my bottom end to enable to to start reving it into much higher rpm's. Now we all know rev are what kills engines but what kinda things should I be looing at changing to allow say a 7.5k or 8k rev limit. atm its pretty standard (all fresh and new tho).

Current ideas are:
arp rob bolts (a must)
a fully worked crank, cross drilled etc
maybe a 4 bolt cms

any ideas?

Hi Anton - as an example and for information only, I ran my 1380 5 port to 8.2k, bottom end was wedged cross drilled nitrided crank with a steel main cap, innocenti rods - though A+ seem trouble free as well, ARP bolts, u/light flywheel/backplate - and the prpoer Vanderval bearings. The crank and rods live on and are now in K motor and running to 8.7K - with a steel 4 bolt main.

If Carling made Mini engines
it would probably be like this one!

balance is key to longer life high revving engines, this is why i spent £150 getting a full rotating balance on my engine which will also be revving upto (and probably over) 8,000rpm

I've seen the future and tbh its Pie

Who did your 4-bolt mains Pete, would be interested to see other companies take on the subject....

I change up at 3000 rpm. LOL.

Sometimes get to 4000rpm in top.

I dont understand?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

This sounds very interesting, I'd love to see some pics of this 4 bolt main that ties in the sides of the block etc, that was a thought I had some time ago after messing around with Pug engines as these have cross bolted main caps.

http://i24.photobucket.com/albums/c2/carl1964/000_0109.jpg


http://i24.photobucket.com/albums/c2/carl1964/000_0171.jpg

some of these

http://i24.photobucket.com/albums/c2/carl1964/000_0104.jpg

Edited by fastcarl on 4th Sep, 2006.

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You've got to the point now where it gets really expensive to get any quicker ant. told you you should have turbo'd it hehe.

Tis a lovely car to drive though, glad you actually stuck a 300deg cam in there rather than listening to all the doubters on other forums. oh no any more than a 286 and it wont idle, it wont do anything unless you sidestep the clutch at 3500rpm etc etc etc.