Calling all 5MGE engine experts...

[rwhite]

I am in the middle of an engine rebuild on my 85 and I can't seem to find any good info on the 5MGE. I have done some measurements with a graduated cylinder and clay on the piston but I just wanted to check and see if anyone had these numbers or has done any measuring so we can compare numbers.

Serviceable limit (How much material can I remove) on the Cylinder Head or Engine block? ( I have seen 0.006" for cylinder head, but that seems tiny)

Piston Dish/Dome volume (measured about -1.5cc)

Combustion Chamber volume (measured about 50cc)

Factory gasket thickness (1.2mm or 0.047")

Piston to valve clearance (measured between 0.110" exhaust and 0.105" intake and this was with a 1.4mm or 0.055" head gasket)

These numbers are usually not that hard to find on other engines, but I guess that's what makes the 5MGE so special!

[CJSREDPRA]

Have you looked at the engine section of the online TSRM yet???

[rwhite]

Yeah, I have looked throught the EM section and the EM portion of the Service Specification section and I don't see any of the numbers that I am looking for. It does give some specs on warpage, but that seems to be about it for the cylinder head and the block surfaces.

[StanS]

Will the tsrm help?
http://www.cygnusx1.net/supra/librar...KII/index.html

[CJSREDPRA]

See previous post from him. No help here, he already looked.

[Dave A.]

Sounds like you've figured out some of the "race engine" info. that's missing in the TSRM. :lol: Now all you/we need is the specs. for the stock valve timing and cam profiles. 8-)

[rwhite]

Well, I wouldn't take any of the numbers I posted as exactly accurate. I am going to repeat the combustion chamber volume and piston dish/dome volume measurements so I can validate the first round of measurements. I am preparing the supra for scca ITS and there is a very detailed set of allowed engine modifications. The one I am working on at the moment is raising the comp. ratio by 0.5. I don't think it is going to take much to do that but I don't want to raise it more than the allowed amount and I also want to keep the valves from hitting the pistons. So if anyone else has any of the measurements it would validate my results.

[rwhite]

If anyone is interested, I repeated the combustion chamber volume and piston dish/dome volume measurements.

Combustion Chamber Volume = 52 cc

Piston Dish/Dome Volume = -3cc

These numbers are for a stock 5mge.

[Dave A.]

If anyone is interested, I repeated the combustion chamber volume and piston dish/dome volume measurements.

Combustion Chamber Volume = 52 cc

Piston Dish/Dome Volume = -3cc

These numbers are for a stock 5mge.

What spark plugs did you use when measuring the combustion chamber volume? The stock heat range ND/NGK's, or something different??

[RaptorRacing]

Keep the discussion going boys...information coming out in this posts is just awesome. I'm gonna sticky this posts for now...good stuff.