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Engine Specific Info and Questions => IDI Engine => Topic started by: L1V3N 1T on February 16, 2010, 05:09:30 pm

Title: questions on internals
Post by: L1V3N 1T on February 16, 2010, 05:09:30 pm

i have a 90 td that is my DD i have a parts engine from a 91 straight diesel does every thing match up spec wise for the heads and block. I finaly got some head studs so i want to rebuild the head of the 91 and take a sunday to tear down and get it back to gether for monday.
Thanks

Title: Re: questions on internals
Post by: Dakotakid on February 16, 2010, 05:46:29 pm

So, apparently, your question is whether or not you can safely interchange a hydraulic N/A head with a hydraulic TD head....and whether or not the N/A head is adequately alloyed to survive the heat?

This topic was kicked around recently and I think Libby was wanting a definitive answer for it.

All I can say is that when I purchased a rebuilt head from (the "other" forum) Jack in Ohio over a year ago, Jack stated that there was "NO DIFFERENCE" in the "D" and "T" heads and that he could accept the standard (commonly supplied from the factory) "D" head (N/A supplied) to rebuild and then safely supply for a turbo application.

Furthermore, these hydro heads require the more expensive TRW valves (sodiums?) for rebuild.

However, this does NOT hold true for mechanical heads.
Anyone with an opposing view?

Title: Re: questions on internals
Post by: Rabbit on Roids on February 17, 2010, 09:01:34 am

i would use whatever head i had to use to get the sodium valves. but i thought they only came in factory turbo engines?

of course you could buy them aftermarket and put them in whatever head you want.

Title: Re: questions on internals
Post by: L1V3N 1T on February 18, 2010, 05:18:56 pm

So i called up the dealer this morning and you are correct they changed the exhaust valves on the turbo, the intakes are the same. I found the intakes for $12 each but i am having an issue finding the exhuast ones through the parts places my work can get good deals through. the stupid VW dealer want $40 a piece. Now the next question does any one know if there is any thing different in the bottum end?

Title: Re: questions on internals
Post by: Dakotakid on February 18, 2010, 05:58:32 pm

Turbo engine uses oil squirting (piston) nozzles and the turbo crankshaft is drilled slightly different on the crank weights.

Title: Re: questions on internals
Post by: L1V3N 1T on February 19, 2010, 03:07:33 pm

ok well thats crappy i can't use much on this parts engine. thanks for all the info tho save me from finding out the hard way!!

Title: Re: questions on internals
Post by: theman53 on February 19, 2010, 05:30:03 pm

Air cooled engines plus has full stainless valves for less than what oem sodium filled are. He is in Tiffin ohio. See my build thread for anymore info.