Engine Piston and Cylinder Polishing

[Passim]

Back in the good old days when cars were all carburetted, one of the prefered way to enhance the performance is to do thing like valve polishing, valve seat adjusting, cylinder head surface polishing, port correction, boring and honing, etc, etc.

 

This increase the enginee HP output by a big amount as the fit between moving parts are almost perfect and as a result little energy is lost to friction and heat build up.

 

I wonder if this method is still being used today or has any one tried it.

[Yeobh]

Today's performance enchanment is maily porting and polising of engine cylinder head exhaust and intake manifolds.For diehard, besides polishing pistons they also weight and trim the pistons skirt to make that all the pistons are of the smae weigh.

[Louis]

sounds promising... what kind of power gains are we looking at in terms of percentage? do you know how much this would cost? any workshops in singapore with a flow bench and provide this service?

 

thanks in advance

Edited April 1, 2005 by Louis

[Megalord]

Boring and honing seldom seen liao. Although i got the honing tool, i seldom use it nowadays too, i mean, i try not to use it liao. Not worth the effort, unless i am on holidays to slowly play around with clearance. But i think no one do polishing of cylinder head nowadays liao. Not worth the effort, unlike boring and honing.

[Lordalfa]

Polishing the piston heads reduces detonation.

 

Swirl polishing valve heads do improve flow but most modern valves are factory polished.

[Yeobh]

I once read an article published by Norton Abrasive, if I recall correctly, some experts in porting and polishing claim they can easily add another 15% more Hp.

Well there are few shops in Spore doing cylinder head porting and poslishing, but not sure of thier skill level. Have not seen an air flow bench in Singapore.

[Lordalfa]

Nobody has a flow bench.

[Megalord]

You can try... k** m*t**, i believe they got, and alot, but dunno if its applicable to small engines like cars type. They work quite alot on ships engine though. Wait, dun try. IMHO, I think they will not entertain small small requests, esp when they are always very busy at work.

Edited April 3, 2005 by Megalord

[Normal_aspirated]

issit same as port & polish ?

Edited April 3, 2005 by Normal_aspirated