Anonymous

Has anyone on here used them and is willing to talk about how well they worked or didnt work?


Chip

AlexF

yup in my new engine

I'll tell you next weekend

It feels good tuning it over thou.... loads of compression even on dry bores.

Alex

rstoughy

iTrader: (5)

I used them in one of my cossies.

Mike Lowmand of Lowmand Jones Developments fitted mine.

Only thing is that they needed replaced after a couple of thousand miles other than that they were fine.

Anonymous

Im not aware of a reason for them needing replacing sooner than normal rings, can someone explain to me why that might be the case.

I'm planning to use them for the first time in an engine im building for SBD16V off here for his astra but would be keen to hear as much as possible about them first as obviously its not my engine i'm experimenting with, although Rob will not be too fussed if he have to reblock and rering it after a few thousand miles anyway TBH if they wear bores out faster or something, but i cant see why they should?

*Bri.4.b.Cos*

I had them on my cosworth pistons in me old s2, were platinum brand ones i think, had no probs, after about 3000 miles the honeing marks on the bores were disaperaing

Bri.

JTECH James

iTrader: (13)

it must be cause the ring cant compress as the standards ones do.....

Anonymous

From what little i know about them, the ring can still compress, they overlap to form the seal.

JTECH James

iTrader: (13)

ahh, so do you need to machine a wider gap in the piston or are the rings narrower?

Anonymous

The total height is the same but they area made of a slightly narrower ring and a very narrow ring which overlap:

Anonymous

look at the ring around the red and yellow bits and you can see it.

JTECH James

iTrader: (13)

must be due to material type then then?

Do the oil control rings change to? maybe they clean the oil off the bore better and cause more wear

Anonymous

The oil control rings are a conventional type, in fact you can use standard ones and not buy them at the same time if you wish.

Anonymous

PS

The only reason i can think for more wear would be due to possibly exerting more force outwards onto the bore, but i cant see them doing that by much or it would start effecting performance too!

JTECH James

iTrader: (13)

if the total size is the same ,it can only be pressure on the bore, or material type that can cause more wear.....

JTECH James

iTrader: (13)

ahhhh great minds think alike!

Anonymous

Its possible the structure of having effectively an extra ring might add to wear, but IMHO tht should be offset by cutting out blow by that kills rings anyway!

Anonymous

Fools seldom differ

JTECH James

iTrader: (13)

if the cutting edge of each ring does the wear ,then i suppose you have twice as many..... but the overall height must be the same or the rings would seize in the pistons as temp increases.

JTECH James

iTrader: (13)

interesting topic....... need more peep who have used them really, and taken engines apart that have used them....

bud-weis

presumably it's blow-by your trying to eliminate Chip? is it that bad that you need to try these?

don't know that much about them though tbh, how do you know they are the right size for the piston? presumably there's no gap to measure when fitted to the bore?

enlighten me

JTECH James

iTrader: (13)

you could still measure the gap , just turn the rings as there is two on each gap so they line up, obviously when they are fitted the gaps would be 180 degrees apart,

I think

Anonymous

You can still size them with an appropriate "end gap" on the main portion of the ring.

Its to try and maintain a better leakdown result for longer that i wish to use them as nitrous engines have massive cylinder pressures and can "eat" the ends of the rings and increase the gap fairly quickly.

xr4x4rs

iTrader: (5)

my mate ran them on his tomcat turbo engine which was pushing 258bhp

as far as im aware the car is still going strong now, never had any problems what so ever

got them off a local engineering company who recommeneded them only cost 100 quid which i didnt think was a bad price

they use them in there v12 race jag engines and have no worries

bud-weis

yeah i can imagine what nitrous does!!!

what block material is the LET? are the rings compatible in that respect? do they even come in different grades or materials?

can only see premature wear being due to incorrect sizes,or wrong materials

Anonymous

The LET is a lump of old pig iron, just like a YB