So, what's my rev limit?
Turbo Mini Forums

Where should I set the rev limit on my new 998?

The key elements:

Hypatechs:


MED ground, lightened, nitrided and balanced crank:


MED lightened, shot peened and balanced rods, ARP bolts:


Is 8k realistic?

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."

weight of the hypatecs paul?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

No less than 7k

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

No more than 13k

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

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."

What cam !!

rick

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."

Well I'm intrested to know. Hopefully I'm going to aim for 7k without the rods being worked...

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

High LSA........... 7k

8K then.lol

Rick

In the grand scheme of things it is not just the cam but the head efficiency too.

The bottom end componets should easilly take 8k rpm. The life span ultimately depends on the end use. If its a road engine with the occassional track day, then I see no issue, but if its a track car or all out race car, the pistons might be the weak point. Having said that The twins seem to do well with the pistons they run.

Edited by Sprocket on 9th Dec, 2012.

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."

Use a crank damper and get the bearing clearancies as tight as you can get to bottom limit. That might be a problem as the crank has already been ground, and probibly to a generic spec of "it'll do"??...

Well my old 998 (+20) regularly saw 8k, with standard bottom end. Eventually it broke the crank after about 30 or 40 thousand miles, plenty of tracks and lots of thrashing around. I just popped a new crank in and its still going. Although now I have detuned it a little going from a 276 cam to an SW5.

I doubt that what you have there, Paul, will be much of a limiting factor.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Engine has damper:



Crank was prepared the same as used by Mini Sevens and checked with plasti-gauge on build. I'm sure MED do not use an "it'll do" attitude for race engine components.



Ben H, Thanks, that's what I needed to hear.

Edited by Paul S on 10th Dec, 2012.

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."

It all depends on the pistons I'd say. The rest should manage 8000easy as per Se7ens.

Paul what did you paint the engine with?

Edited by gr4h4m on 10th Dec, 2012.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Matt black Hermetite Engine Laquer - good for heat transfer and another 100rpm :)

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."

dumb question the Hypatechs are the drilled ones?

Yep, drilled, not slotted.

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."

cool I was reading Des Hamils book who was stating not to use high temp paint, so I will looking for some of thsi stuff. Will have a look in the local Halfords.

I fancy a black engine this time the green is a pain to keep clean...

Edited by gr4h4m on 10th Dec, 2012.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Come on Paul.
This shoud be in the "show us yours" section. You know very well where to set the rev limit. You have given this a lot off thoughts, before you started the build.

But nice of you to show us Looking forward to see the dyno result

If i have more toys than you when i die, I WIN

Do your rods have balancing marks?

On 10th Dec, 2012 TurboTom said:
Come on Paul.
This shoud be in the "show us yours" section. You know very well where to set the rev limit. You have given this a lot off thoughts, before you started the build.

But nice of you to show us Looking forward to see the dyno result

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."