Another build thread

[Johno]

Originally Posted by SeriesLandy

Ash said he has had 3 fail and changed his (brake) switch to a mechanical one.
Also Coozer over on LB Link

So is there a better quality hydraulic brake pressure swith we can fit?

[robo]

Originally Posted by skov

It's an emissions / fuel economy thing. Most ECU's will stop injecting fuel when you're slowing down on closed throttle - but will start injecting again if it's put in neutral or the clutch is depressed (to stop the engine stalling).
If you just leave the switch out the revs will dip, and possibly stall when you stop.
If you bypass it it'll probably be fine, but use more fuel.

I suppose you would lose a bit of engine braking if its just bypassed.

Bob

[skov]

I decided to separate the engine and gearbox the other night.
Can of worms comes to mind!

The bell housing is full of gunk and engine oil.

There's pretty much zero friction material left on the clutch.

The clutch release and flywheel spiggot bearings are knackered.

and the flywheel is covered in cracks!



I think the source of the oil is the cam angle sensor, which sits on the back of the head just above where the engine and gearbox mate.
CAS seal leaks are very common on the MX5 and there's evidence that this one had a massive leak judging by the amount of oil below it. I think it had been working it's way into the bellhousing for quite some time.
Saying that, I'm not 100% sure the crank seal isn't leaking too...

Not sure what to do about the flywheel. I took it to my local friendly garage and they advised me not to put it back as it is.
I might be able to get away with getting it re-faced, but I am slightly tempted to replace it with a lightweight replacement Just not sure funds will allow that!

[chrisponter]

I was thinking of replacing the flywheel eventually too, check these guys out

http://www.flyinmiata.com/index.php?...500%20%2010.30

Not too bad in my opinion

[CTWV50]

Originally Posted by skov

I decided to separate the engine and gearbox the other night.
Can of worms comes to mind!

The bell housing is full of gunk and engine oil.

There's pretty much zero friction material left on the clutch.

The clutch release and flywheel spiggot bearings are knackered.

and the flywheel is covered in cracks!



I think the source of the oil is the cam angle sensor, which sits on the back of the head just above where the engine and gearbox mate.
CAS seal leaks are very common on the MX5 and there's evidence that this one had a massive leak judging by the amount of oil below it. I think it had been working it's way into the bellhousing for quite some time.
Saying that, I'm not 100% sure the crank seal isn't leaking too...

Not sure what to do about the flywheel. I took it to my local friendly garage and they advised me not to put it back as it is.
I might be able to get away with getting it re-faced, but I am slightly tempted to replace it with a lightweight replacement Just not sure funds will allow that!

Sh*t , cracks!! How many miles has it done?

[skov]

Originally Posted by chrisponter

I was thinking of replacing the flywheel eventually too, check these guys out

http://www.flyinmiata.com/index.php?...500%20%2010.30

Not too bad in my opinion

Looks good - I could quite easily spend a silly amount of money on that site!

I almost bought the 4kg Ultra Light Weight one from ILMotorsport yesterday:

http://www.ilmotorsport.de/shop/article_detail.php5?aid=3889&oid=12&depth=0&page=0 &count=6&PHPSESSID=eb6dbcd7a70582bdd4310ca19a45e67 e

But then I stuck a post on MX5Nutz and someone's offered me a standard flywheel plus a low mileage clutch for £30, and being a cheapskate I think I'll get that instead

Originally Posted by CTWV50

Sh*t , cracks!! How many miles has it done?

Yeah the face where the clutch mates against it is absolutely covered in hair line cracks! I don't think it's in any danger of failing just yet, but I reckon I'll play it safe and replace it!

The car had allegedly done about 60k, but I'm starting to suspect it had done rather more than that...

[CTWV50]

Originally Posted by skov

But then I stuck a post on MX5Nutz and someone's offered me a standard flywheel plus a low mileage clutch for £30, and being a cheapskate I think I'll get that instead

Nice one. So easy to get carried away with things. Lighten flywheels are one of the many ways to spend more to get less? WTF!

[BORNXenon]

Originally Posted by CTWV50

Nice one. So easy to get carried away with things. Lighten flywheels are one of the many ways to spend more to get less? WTF!

Like womens underwear. The more they spend, the less material there appears to be. Not that I'm complaining like!

Must say though, I had a lightened flywheel on my old Vectra and it was one of the best modifications I ever made. Still have that engine sat in the garage, will be going in my build, some time after I have enough funds to even start!

[skov]

[K4KEV]

Hi John.....looks like it has been drifted to within an inch of its life, the engine I have displays similar cracks but I have a junshop lightened flywheel and my crank is going to be reground.....dont really think you will get away with that level of cracking but maybe its a case of giving it ago.....nowt to lose is there.