how much to take off a flywheel??

Post Thu Dec 05, 2013 12:21 pm

how much weight can i take off a m20 flywheel before it doesnt tick over at all, i want it to hunt up and down at idle

Post Thu Dec 05, 2013 12:33 pm

Why would you want the engine to hunt at idle??

If you want a "lumpy" idle then fit a lumpy cam lol

Post Thu Dec 05, 2013 12:36 pm

steve_k wrote:Why would you want the engine to hunt at idle??

If you want a "lumpy" idle then fit a lumpy cam lol

+1

If you shave too much off your going to have some fun in traffic trying to move off smoothly

Post Thu Dec 05, 2013 12:36 pm

it might sound daft but i like it lol the flywheels off the car at the minute and was gonna get it skimmed before it went in anyway so thought id take a bit more off than usual but need to know specifics so the professor can set to

Post Thu Dec 05, 2013 12:38 pm

Cypriotgeeza wrote:
steve_k wrote:Why would you want the engine to hunt at idle??

If you want a "lumpy" idle then fit a lumpy cam lol
+1

If you shave too much off your going to have some fun in traffic trying to move off smoothly

thats a good point i didnt think of that one

how much would you take off lol

Post Thu Dec 05, 2013 1:23 pm

I have a knackered idle control valve, that will make your engine hunt, perished hoses, and broken TPSs here also. So we should be able to get your car running how you want. £30 each posted, so cheaper than lightening a fly.

Do we have a face palm emoticon?

Post Thu Dec 05, 2013 1:50 pm

Post Thu Dec 05, 2013 1:52 pm

Wow, and you were able to pass a driving test?

Is the world getting thicker or do I just notice it more the older I get?

Post Thu Dec 05, 2013 1:55 pm

ross_jsy wrote:Wow, and you were able to pass a driving test?

Is the world getting thicker or do I just notice it more the older I get?

Your just becoming a grumpy old coont!

Post Thu Dec 05, 2013 2:00 pm

While lightening the flywheel to "make it lumpy" is just idiotic, you can take an M20 flywheel down to the 6kg mark before you risk it shattering and taking out your legs on its way through the transmission tunnel.

Post Thu Dec 05, 2013 2:41 pm

maggspower wrote:I have a knackered idle control valve, that will make your engine hunt, perished hoses, and broken TPSs here also. So we should be able to get your car running how you want. £30 each posted, so cheaper than lightening a fly.

Do we have a face palm emoticon?

got a split fuel pipe here too

Post Thu Dec 05, 2013 4:10 pm

5.8 is about as far as most think is advisable. It won't effect the idle one bit on a stock M20.

A nica hairy cam like a 288/288 schrick will make it idle like sh!t

Post Fri Dec 06, 2013 1:59 pm

I'm not just lightening it to make it idle shit in rebuilding the whole engine and want decent power and was going to lighten it anyway just wanted to know how much to take off, thanks to the people who actually gave me some decent answers

Post Fri Dec 06, 2013 2:19 pm

Hedley48 wrote:I'm not just lightening it to make it idle shit in rebuilding the whole engine and want decent power and was going to lighten it anyway just wanted to know how much to take off, thanks to the people who actually gave me some decent answers

That is exactly what you said:

Hedley48 wrote:how much weight can i take off a m20 flywheel before it doesnt tick over at all, i want it to hunt up and down at idle

Simon13 is correct, the engine will idle just as good as with a lightened flywheel as it will with a standard one.

The quality of answer often reflects the question.

I actually lighten flywheels.

A lumpy idle means either the car is not running correctly, or it is a by product of the engine tune, usually the cam shaft, if the latter is the case. If you are looking at power, then the m20b25 is decent in standard tune, if its not the b25 or larger that you are rebuilding, then consider making it so.

Here you go, even a picture for you:

That one is not as light as you can go.