Ttv Flywheel Problems

[dobboy 231 2 Cars]

oh one more Q.

 

i'll be changing the timing belt on another engine going in my car, and by the looks of my bottom pulley it hasn't slipped (yet) as the timing holes all seem to line up.

 

On the engine thats in just now i temporarily fitted an 8v bottom pulley (as the pulley rubber had slipped) to get it timed up.

 

Looking as these lightened bottom pulley's (and the cost of them), what's the difference in weight between lightened and standard 16V?

 

Could the 8V pulley be used (although it has less belt grooves) if a suitable aux belt was fitted?

 

I've not weighed the 8v or 16v pulley's yet or gave myself a KUTA yet to do my mods, but, anyone got any idea?

[petert 586]

I bought a smaller diameter, solid XU9J4 pulley from Miles. Workmanship is superb and it works a treat. I was having trouble with the std pulley over revving the alternator. It still charges at idle however. Even when adding post to AUS I thought it was excellent value.

[dobboy 231 2 Cars]

PeterT, (beware i'm scottish and renowned for being tight), but i really feel reluctant paying £80+ for a crank pulley.

 

I can see the money in the flywheels but rightly or wrongly i don't see the money/work in the pulley, (so i'll do without).

 

But, still wondering if there is any foreseable problem using an 8v bottom pulley (which i'm guessing is lighter than a standard 16v pulley).

[petert 586]

There's no problem using the 8V item if the balance is ok and the alternator lines up. I don't recall the pulley being that expensive. In any case, well worth it when you consider new or replacement price.

[dobboy 231 2 Cars]

Thanks PeterT.

 

If the 8V pulley is significantly lighter than my ok condition 16V pulley i think i'll give it a go.

 

The 16V aluminium ones range from £75+ (delivered) upwards from what i've seen.

 

As these are a "nice to have" (for me) i'm gonna do without and give the 8V one a go if it's lighter.

[dobboy 231 2 Cars]

 

 

1. So to fit a TTV flywheel, fit 8 new bolts (Pt No. 0573.40) to the crank

 

2. Drill out clutch cover holes to 8mm and buy/fit 6 M8 x 20mm cap head machine screws.

 

 

 

TIA

 

Can any of you guy's remember what the pitch is on the the threads for item 2?

 

Is it the finer type thread found on some of these type of cap screws for engineering type jobs (1mm)? or standar M8 (1.25mm)

 

TIA

[dcc 855]

Iirc its same as the 8v flywheels so what ever pitch they were

[welshpug 1,657]

yeah std 1.25 pitch thread, 6923 G6 will do the trick, its a widely used socket headed capscrew used on many many things INC XU7 and XUD clutch pressure plates.

[dobboy 231 2 Cars]

yeah just noticed that.

 

8V is M8 x 1.25

normal 16V is M7 x 1.00

 

So as the holes for them need drilled out to M8 it looks like DCC remembers correctly.

 

Thanks

[dobboy 231 2 Cars]

Got mines fitted yesterday no problem. They look really well made.

 

One thing, i compared an 8v crank pulley wheel with a 16v one. I didn't have scales to weigh them but the 8v one is significantly lighter and is same diameter, only difference is less ribs.

 

Has anyone ever tried using an 8v crank pulley instead of buying a lightened one? Obviously a suitable belt would have to be selected.

[petert 586]

I only run a 4PK belt on my race car. It's more than ample if it's only turning the alternator.

[dobboy 231 2 Cars]

Thats what i thougt Peter, but on closer inspection i dont think the 8v pulley can be used on gti6, as the 16v one has a bigger offset to push it out to line up with alternator. Pity

[rallyeash 155]

I only run a 4PK belt on my race car. It's more than ample if it's only turning the alternator.

Same.