110mm bore 928 engine project - plans for a 7.4 liter in the works.
11-20-2005, 11:26 PM
#1
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110mm bore 928 engine project - plans for a 7.4 liter in the works.
Many of you may recall the "mystery red" car as it was referred to. A 1987 S4 running 22+ psi of boost via Paxton supercharger. This was a stock 928 except for the 944 Turbo rods & pistons (and blower)
Right now that same car is running about 14psi with a 6.4 liter 928 engine. This is also the same car running the gear vendor reduction drive.
This is a sister motor to Jim Page's engine here: Click here for pictures
Three identical engines were produced from the above specs. The third belongs to a Rennlister.
This is the latest project. A 110mm steel bore 928. The first "version" of this engine will be a tame 6 liter running at least 22psi of boost. Phase 2 will be a 7 liter running a now undetermined amount of boost (depends what is learned with the 6 liter setup). Eventually he has plans for a 7.4 liter N/A race engine; he already has the crank for this setup.
Todd makes the steel sleeve’s himself at the machine shop where he works. All block modifications are also performed by him, much of the work coming out of his garage.
Excuse the pictures; I only had my camera phone on me. I'll be back there later to take better photos. I stopped over to see if he could help me with my drain plug issue in a different thread. I was not expecting to see any of this.
Will this setup be available for purchase? He has talked about building these motors as a side project. It is too early for any cost estimations. I think this is an 85-86 block.
Right now that same car is running about 14psi with a 6.4 liter 928 engine. This is also the same car running the gear vendor reduction drive.
This is a sister motor to Jim Page's engine here: Click here for pictures
Three identical engines were produced from the above specs. The third belongs to a Rennlister.
This is the latest project. A 110mm steel bore 928. The first "version" of this engine will be a tame 6 liter running at least 22psi of boost. Phase 2 will be a 7 liter running a now undetermined amount of boost (depends what is learned with the 6 liter setup). Eventually he has plans for a 7.4 liter N/A race engine; he already has the crank for this setup.
Todd makes the steel sleeve’s himself at the machine shop where he works. All block modifications are also performed by him, much of the work coming out of his garage.
Excuse the pictures; I only had my camera phone on me. I'll be back there later to take better photos. I stopped over to see if he could help me with my drain plug issue in a different thread. I was not expecting to see any of this.
Will this setup be available for purchase? He has talked about building these motors as a side project. It is too early for any cost estimations. I think this is an 85-86 block.
11-20-2005, 11:48 PM
#4
If todd can make this work and it holds together, then thats the end of it. No more doubts about longevity.
I gotta call him.
I gotta call him.
11-21-2005, 12:27 AM
#7
The guy is great Tony. Very gracious with info and a true enthusiast. This stuff is not cheap though, and I wouldn't expect it to be.
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11-21-2005, 08:42 AM
#8
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How do you plan to seal the sleeves in the block to prevent leaks? I am planning on going with sleeves as well but I am concerned about coolant leaks into the pan around the base of the sleeves given the different expansion rates of the two different materials.
11-21-2005, 12:10 PM
#11
Three Wheelin'
This appears to be the same "technology" that Bob Devore and Lucky Eckman developed 15 years ago. I always wondered why no one else pursued this direction. Bob Devore solved the "leaking" issue with a special epoxy. I don't think you need a late 5 liter block to do this. I think it can be done to the earlier 4.5 or 4.7 blocks as well making the cost a little more pallatable. There are some old Excellence mags that detail this procedure.
11-21-2005, 12:50 PM
#12
Very interesting, he gets my thumbs up, is it a 2 valver or 4 valve engine? Hope he succeeds, yes I can see the money everywhere in that project. But, the driveline must be a great concern. No point going this far without having a plan for the driveline. Is there any options for this?
Cheers and well done
Greg
Cheers and well done
Greg
11-21-2005, 12:55 PM
#14
Three Wheelin'
Do the S4 heads flow enough to support a 7.4 liter engine? I imagine you can probably run a lot more cam without running into idle problems in an engine of this size.
11-21-2005, 01:16 PM
#15
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Originally Posted by FBIII
I imagine you can probably run a lot more cam without running into idle problems in an engine of this size.
