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Wanted: 1 Piston


Spindoctor

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Hello all-

I need to acquire 1 original piston for a 2002 918 3.5ltr V-8.

There is an oil consumption problem I am having with a new set of custom mades and I believe that the oil ring land and return holes

are not suited for an engine with oil squirter's.angry.gif

The originals did not come back from the builder and they are no where to be found.

Piston does not need to be new or perfect (one piece would be preferred) for comparison purposes. thumbup.gif

Thanks in advance- Tim H

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Hi Tim,

I can let you have a used standard piston. Do you know which size grade you have in the engine?

Just give me your address and I´ll get on in the post over the weekend.

Who is the supplier of the pistons? If they are JE, then I would be very surprised if this is the problem. There are many sets of these pistons in the field and I´ve never heard of an oil consumption issue related to their use.

What kind of consumption are you experiencing - are the valves/plugs oil fouled?

What is the compression in each cylinder?

What specified ring gaps did the builder work to?

Cheers,

Mike S

Edited by mike_sekinger

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Mike,

Thanks for the reply.

This has been a multiple builder (3), component issue. Three rebuilds and the same oil control problem returns.

High oil consumption with blue oil smoke and plug fouling.

If you run the motor until full warm, shut it off, wait until cool and pull the plugs you will find a puddle of oil on

every piston.

The guides and seals have been positively eliminated as the source.

Currently the piston set is a Diamond. It is my belief that the first set of pistons were not made correctly

and that the rest have been copies of a bad design. Thus the need for an original for comparison.

The current builder is very skilled at machine work. Much time was spent with the ring tech at 'Perfect Circle'

to match the gap less ring set to the final plateau hone with the correct ring end gaps for the ap.

I very much appreciate the use of you pistonunworthy.gif

Our address is

F.A.M.E. Automotive

18028 Redmond Way

Redmond, WA 98052

I will certainly post back with an update to our findings.

And, as always, any comments or related info is appreciated.

Tanks again- Tim H

P.S. - I bet I can R&R this motor faster than anyone at this point!

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Hi Tim,

Sounds very unlucky.

Why did you decide to go with an unproven piston? Do you have a special relationship with them?

What ring gaps did you use?

I

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Just to let you know that the piston is on the way to Redmond.

cheers,

Mike S

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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  • 2 weeks later...

Mike,

Thank you so very much for the piston.unworthy.gif It arrived this morning and two seconds after opening the package our suspicions were confirmed.

The oil return holes behind the rings on the OE piston drain straight down and do NOT penetrate to the inside of the skirt.

Therefore oil from the squirters never gets directly to the rings.

The piston sets that have been installed ( all 3 ) had the scraper returns drain back into the skirts. The direct spray of the oil was too much for the rings to deal with.wallbash.gif

Our builder is going to see if the manufacturer will warranty us a correctly built set.

I am not sure what we can do to return the favor - If you are ever in this part of the world...cheers.gif

Thanks again - Tim H

If you like\need we can return the piston and the postage no problem.

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Hi Tim,

Glad that the piston arrived. No need to return it, I

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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