[volcomstone411]

had a spare flywheel lying around (as u do!) so sent it off to my trusted engine builder to see about some tweeking.....

got a phone call to say its as light as it will go, safely..... poobums!!!!!

ooh well, thought id post it as info so no-one else wastes any time .....

have it balanced to the crank

[mark_f1]

Oooh thanks for the info Jacko, this was on the list of future mods (quite a way away but still there).

[JamesMalin]

I thought FRP FlyWheels were lightened from the standard 1.7's anyway?

[mort666]

Perhaps James has hit the nail on the head. I know for the 1.6 Shawspeed offer a lightened flywheel which is done on an exchange basis and is the standard flywheel machined.

The also do a 'steel lightweight' flywheel as an option too.

It might be advantageous for the standard pumas

[RG500H]

No point doing the flywheel and crank - you really need to spin the whole shabang up - bearings, rods, pistons etc... IF you are going to do the job right.

You can safely mill and drill something out of the Puma and the Racing Puma flywheels - they weigh the same where it matters - the outer facing near the gear ring. I'm doing one next weekend... gulp.

Steel is the way to go for this engine as it is at heart a Yam bike engine and its lumpy bottom end delivery can't get much worse can it?

Why nickle-siliconcarbide the bores? The nature of the liners will probably give you blisters in a few thousand miles even if you treated them first.
The bores are good for 150-200k on a well maintained engine and its the pistons / rings that wear out first.

[owlscastle]

There is a guy on Turbosport forums who I bough a lightweight new steel one for £185 all in.

Ritchie

[volcomstone411]

i cant see why nikasil liners are a problem. Ive known some engine builder pay very high priced to have their bores lined with nikasil.

And i think he paid nearly 20k for that, from memory, either that or 11k.

[masterdonny]

i have a shawspeed lightened 1.7 puma flywheel. the standard 1.7 and 1.6 are the same. dont kno about the frp.

mine made a big differance, but was with cams, throttle bodies and a 8000rpm limiter. dont think it would be worth it on a standard engine tho.

[Dogsbody]

The lightening is only to give better throttle response.
Plus it's only worth getting the balancing done, if you get the Flywheel, crank, con rods, Pistons etc all done at the same time.

I built a pinto engine for an Escort that was lightened and balanced.
That used to scream
The tick over was terrible though

Bit like my MotoX bike, that can't tick over as there is no flywheel, just a small stub with the CDi pickup and a small magnet in.
Amazing throttle response

[ally frp364]

I had a genuine Ford racing flywheel which was sold off the shelf at Ford for my racing Ka and you never had to match to anything. It made a huge difference in that wee thing. On the 7kg standard flywheel it brought it down to about 4 half kg

[mstenn]

I had a genuine Ford racing flywheel which was sold off the shelf at Ford for my racing Ka and you never had to match to anything. It made a huge difference in that wee thing. On the 7kg standard flywheel it brought it down to about 4 half kg

For reference: A standard Zetec-s phase 2 (if it makes any difference) Weighs 7.5kg.
Puma Flywheel off a 2002 Dive ecu'd puma came in at 6.5kg. IMO it feels noticably lighter. When going down through the gears especially.
It also looked different in design. the Zetec-s Clutch would not fit the puma flywheel.(against what i have always been told)
This leads me to believe that there are some different flywheels out there as standard