Advice? Clutch @ Fly Wheel Selection

**aimre** · 11-08-2007 01:07 PM

Originally Posted by SLOWEGG

Why is that ?

He will probably be drag racing. If you go to a flywheel that is too light, you are going to bog your engine down off the line(due to the lighter rotational mass,inertia!) A lighter flywheel does allow your engine to rev more quickly, but lightest is not always best depending on your application.

**Sexc86** · 12-08-2007 06:57 PM

mmm i dont see how it could bog you down off the line... if anything a lighter flywheel would give you better response and pickup... however when changeing gears your revs will drop quicker/more because there is less rotational interia since the fly wheel is much lighter... Aim is to find the happy/medium inbetween but to find this i believe the only real way is trial and error...

**string** · 12-08-2007 09:58 PM

Some rough figures for you. At 8000rpm, a 5kg, 30cm flywheel, as compared to a 10kg flywheel, will hold just under 20,000 joules of energy less. A 200hp motor produces just under 150,000 joules per second, making the surpluss up in under 1/7th of a second.

When changing gears, the reduced rotational resistance of the flywheel is far less of a factor when compared to the actual compression event - but it is still a noticable difference.

**dudeling7** · 13-08-2007 12:20 AM

with my fidanze 7.5 lbs flywheel its not hard at all to drive.

at first it was because you need to give a little more gas or be more precise with throttle off the line. also when jsut cruising and changing gears the revs really fall a lot faster in daily driving.

but when you are red lining or giving it a squirt you really cant notice it drop fast enough to effect you unless you cant shift well. also off the line i dont really see that it bogs, jsut give it a nice launch and off you go

**aimre** · 14-08-2007 09:34 AM

Originally Posted by Sexc86

mmm i dont see how it could bog you down off the line... if anything a lighter flywheel would give you better response and pickup... however when changeing gears your revs will drop quicker/more because there is less rotational interia since the fly wheel is much lighter... Aim is to find the happy/medium inbetween but to find this i believe the only real way is trial and error...

Very easily, you can do it with your stocker. U let it out at the wrong time and the car looses to many rpms and bogs down.

problem is, when ur flywheel is so light, you window of letting out the clutch and not bogging down (or spinning wheels) is smaller.

U do gotta realise, most of the people on this site are NA, as well as most hondas are predominantly used, or think they are used, for track racing.

**DynoDave** · 14-08-2007 09:45 AM

Originally Posted by aimre

He will probably be drag racing. If you go to a flywheel that is too light, you are going to bog your engine down off the line(due to the lighter rotational mass,inertia!) A lighter flywheel does allow your engine to rev more quickly, but lightest is not always best depending on your application.

This has the best TORQUE maker know to the internal combustion engine on it its called BOOST,I think you have been reading to many internet bed time story's about flywheel weights dude.If your car bogs off the line simple fix give it more boost then the problem is solved.
Regards Dyno Dave

**string** · 14-08-2007 03:06 PM

Originally Posted by aimre

Very easily, you can do it with your stocker. U let it out at the wrong time and the car looses to many rpms and bogs down.

problem is, when ur flywheel is so light, you window of letting out the clutch and not bogging down (or spinning wheels) is smaller.

U do gotta realise, most of the people on this site are NA, as well as most hondas are predominantly used, or think they are used, for track racing.

Letting the clutch out "at the wrong time" and bogging is because of a lack of throttle (thus power), not lack of stored flywheel energy. The energy stored in a light honda flywheel isn't enough to get you moving, let alone moving fast.

**aimre** · 15-08-2007 01:42 PM

Originally Posted by DynoDave

This has the best TORQUE maker know to the internal combustion engine on it its called BOOST,I think you have been reading to many internet bed time story's about flywheel weights dude.If your car bogs off the line simple fix give it more boost then the problem is solved.
Regards Dyno Dave

Yeah, cos ppl get HEAPS of boost in neutral.