Endplate Lapping?

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Jan 11, 2005 | 02:38 AM

#21

rx7will

Member

Joined: Feb 2004

Posts: 73

Quote:

Originally Posted by dag' date='Jan 8 2005, 01:51 PM

If you get lapping compound you can lap your irons yourself, it just takes patience and time. You slather the center iron with lapping compound, and then basically rub them together, it actually works out very well.

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I was told the same thing by the owner of a machine shop. Anyone ever try something like this.

Jan 11, 2005 | 07:35 AM

#22

rfreeman27

Senior Member

Joined: Dec 2002

Posts: 4,107

From: fredneck MD

I've done it before. It does work pretty well, and gives you a damn good arm workout!

Jan 11, 2005 | 09:24 AM

#23

Old Splatterhand

Senior Member

Joined: Jun 2004

Posts: 240

From: Germany

is this lapping compound compareable with that stuff they use to "grind" poppet valves in their seats in cylinderheads? diamond paste or something

Jan 11, 2005 | 01:18 PM

#24

GMON

Senior Member

Joined: Dec 2003

Posts: 500

From: Minneapolis,MN

Quote:

Originally Posted by dag' date='Jan 8 2005, 01:51 PM

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Good luck with that.

Jan 15, 2005 | 04:22 PM

#25

FrostRacing

Senior Member

Joined: Jun 2003

Posts: 233

From: Columbus, Ga

I pay $45 a surface. They come out great and only have to go 45min out of my way

Jan 16, 2005 | 09:18 AM

#26

GTUs

Member

Joined: Nov 2003

Posts: 82

where did you got them done?

which method was used?

how was the finish?

thanks

Jan 19, 2005 | 02:08 PM

#27

crionics

Junior Member

Joined: Dec 2004

Posts: 5

Quote:

Originally Posted by GMON' date='Jan 7 2005, 02:19 PM

I did some calling arround one day.

You can take up to 8 thousandths off total(Cant remember that for sure). Only 2 thousandtsh per plate though.

Everyone said good luck getting nitriding thats as good as factory without spending more than a new plate. Nitriding is also less than 1 thousandth so it will not replace enough material if you go more than 2 thousandths on a plate.

A lapped plate will wear quicker but if you premix you dont notice this as much.

Is there a rule of thumb at all about how much longer new or renitrided irons last when compared with lapped housings without the additional nitriding? The engine in my AE lasted about 110, 000 miles. Can I get that again with good compression with lapped irons and new housings and seals?

Jan 20, 2005 | 06:38 PM

#28

Sesshoumaru

Member

Joined: Oct 2003

Posts: 75

I never got my s6 irons lapped. I got them milled. They had some rust on the surfaces so i had to do something (cat pissed on it). You could see the lines from the bit but couldn't really feel it after it was machined.

My concern was not to get it too smooth as the oil would not be retained. It was cheap. About 200 for the engine.

I'm not recommending this to anyone but that's what I did and so far seems to work great.

I think it has close to 10k on the clock now.

I was very happy with the results and will continue to do that to other engines.