985cc Turbocharged Nova Sprint Car

[novarally]

I meant to say i have just removed the gearbox for a check over so i will get some pics of flywheel and clutch for you

Thanks Jezz, that would be very useful.

[toymex]

Hope this helps
Regards
Jezz

[novarally]

Hope this helps
Regards
Jezz

It certainly does, thanks. If you happen to be removing the flywheel (ypu're probably not), could you stick it on the weighing scales for me?

I just need to find the right 7.25" clutch (and release bearing) to suit mine now. I've been advised to avoid sintered plates for my car, and go for a rally spec.

TTV certainly seem to offer a good price.

[lee303]

hi colin

cars looking great! i run a TTV flywheel and a 7.25 and single plate, the flywheel was 2.7KG

in a small block box room is very limited for even the single plate, but it will handle 190 lb/ft all day with a red spring, i use a cerrametalic plate and its surprisingly user friendly, especially with a bit more torque like you have, all from helix via martin bowyer, i had to skim the inside of the gearbox to gain some clearance though ...

as for release bearings, i run a vectra hydraulic release, with a flat face, the round face is recommended by everyone but its very expensive and involves a bit of fab to make it fit the box, i have had no problems with the flat type though, but i do only use it for pulling away as i have a dog box now, but even with the synchro box it didn’t cause me any issues, clutch spring fingers look fine, no excessive wear or anything after 10k on it so far

[lee303]

[toymex]

Lee can you tell me where you got your box and roughly what they cost ,i am looking to upgrade sometime in the future Thanks
Sorry for the thread hi jack Colin

[lee303]

pm en route mate

[novarally]

hi colin

cars looking great! i run a TTV flywheel and a 7.25 and single plate, the flywheel was 2.7KG

in a small block box room is very limited for even the single plate, but it will handle 190 lb/ft all day with a red spring, i use a cerrametalic plate and its surprisingly user friendly, especially with a bit more torque like you have, all from helix via martin bowyer, i had to skim the inside of the gearbox to gain some clearance though ...

as for release bearings, i run a vectra hydraulic release, with a flat face, the round face is recommended by everyone but its very expensive and involves a bit of fab to make it fit the box, i have had no problems with the flat type though, but i do only use it for pulling away as i have a dog box now, but even with the synchro box it didn’t cause me any issues, clutch spring fingers look fine, no excessive wear or anything after 10k on it so far

Thanks Lee, that's excellent information. I picked up the Helix catalogue at the Autosport show yesterday, and they mentioned those aluminium clutch covers like you've used.

Do you happen to know the weight of the clutch plate and cover?

Does the Vectra hydraulic set-up bolt straight into F10/13/15?

I've just weighed my flywheel - 4.5kg (lighter than I was expecting)

and the clutch is 3.8kg total (it's a paddle plate)

[lee303]

no don’t know the exact weight sadly, i imagine helix could tell you though, but having had it in my hands i would guess it was around 1.5 kg, and as some can attest, my engine revs like a bike even as a relatively long stroke 1800
the slave cylinder bolts straight in but the small block input shaft is thinner so the seal needs modding, no big deal, you can use the standard seal fitted into the hydraulic slave body, or you could do the daewoo style clutch release with a slave outside the box acting on the clutch arm if you don’t fancy that, but i would think with a 7.25 a hydraulic would be a must over a cable

are you running a 5 speed casing still? would have thought you could use just 4 gears on most hill climbs and iirc the 4 speed casing is a good bit smaller and lighter, but then it may also be smaller in the bell housing area like the f13/15 is to the big block box and i may also be talking rubbish about not needing 5th!

[novarally]

no don’t know the exact weight sadly, i imagine helix could tell you though, but having had it in my hands i would guess it was around 1.5 kg, and as some can attest, my engine revs like a bike even as a relatively long stroke 1800
the slave cylinder bolts straight in but the small block input shaft is thinner so the seal needs modding, no big deal, you can use the standard seal fitted into the hydraulic slave body, or you could do the daewoo style clutch release with a slave outside the box acting on the clutch arm if you don’t fancy that, but i would think with a 7.25 a hydraulic would be a must over a cable

are you running a 5 speed casing still? would have thought you could use just 4 gears on most hill climbs and iirc the 4 speed casing is a good bit smaller and lighter, but then it may also be smaller in the bell housing area like the f13/15 is to the big block box and i may also be talking rubbish about not needing 5th!

Definitely I need 5 gears. I need about 110mph, and I can only hit that with a 5th gear (on Quaife ratios anyway).

I have a hydraulic clutch on mine, but it actuates as a slave cylinder pushing directly onto the clutch release lever arm.