110mm bore 928 engine project - plans for a 7.4 liter in the works.
#17
Thats a concern H. It looks like he is tying these pots together and they are pressed in, thereby creating structure.
#18
Three Wheelin'
Originally Posted by heinrich
very interesting. Almost not enough structurally left of the block?
Haven't you heard of JB Weld? Slide in the sleeves, pour in a half gallon of JB Weld and you are done. No Leaks. No block flexing. Amazing stuff.
Seriously, Todd is the most amazing, and talented, car guy I've ever talked to. He tackles projects, and completes them, that any one else would only dream about. Someday, I have to meet him in person.
#19
Originally Posted by Louie928
Seriously, Todd is the most amazing, and talented, car guy I've ever talked to. He tackles projects, and completes them, that any one else would only dream about. Someday, I have to meet him in person.
haha..funny you say that Louie.....as most people including myself would say the same of you...the only difference being that I have had the pleasure of meeting you in person .
Later,
Tom
P.S. Todd sounds pretty cool too...
#20
Three Wheelin'
Originally Posted by Tom. M
haha..funny you say that Louie.....as most people including myself would say the same of you...the only difference being that I have had the pleasure of meeting you in person .
Later,
Tom
P.S. Todd sounds pretty cool too...
Later,
Tom
P.S. Todd sounds pretty cool too...
#21
Drifting
Join Date: Jul 2002
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Cheaper to experiment with things like exhaust...
I have great appreciation for those who are willing to experiment with engines...
Those can be expensive mistakes.
I have great appreciation for those who are willing to experiment with engines...
Those can be expensive mistakes.
#23
Rennlist Member
Straight J.B. Weld won't work well. Use an aluminum based expoxy with Aluminum puffs, 1/8" ***** of aluminum castings. That will get the coefficient of expansion right and add a lot of rigidity. It has been done by Devore and the 944 crew did this years ago. Very nice machining, however. Make sure to leave the sleeves about 0.001 to 0.0015" protruding from the deck, however.
#24
Rennlist Member
Take a look at Darton's MID and look at the hole in the flanges necessary to keep heat build up down. You can do that now with no real problem. Later it is more difficult.
Nice looking work.
Nice looking work.
#25
Rennlist Member
Very much the same as the original DEVEK R&D, with a few nice cchanges, but the same "tie it tot he block" sleeve concept. I still have one sleeved block here ready for boring ... time for a picture.
Looks like fun, good luck!
7.4 ... WOW!
Marc
Looks like fun, good luck!
7.4 ... WOW!
Marc
#26
Originally Posted by 928FIXER
Whats the bore and stroke on the 7.4 liter engine?I love cubic inches....kinda like walk softly and carry a big stick.
I know Sniper likes it.
#27
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Probably say the same thing he did after the 2 liter 911 engine grew to 3.2 liters.Something like .. "Obviously we made the engine too large in the first place"
#28
928 Collector
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Or: "We designed this into the motor with the intention of doing it all along" .... they did mean for it to be a 6-litre car initially, that much is historical fact. Imagine it. Just imagine the ANIMAL the 1978 porsche 928 would have been.
#29
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I thought the engine design was 4.5 to 5.4 liters with the test mules at 5.0 on Webber carbs ? The stroke at 78.9 mm was so much longer than a typical Porsche engine. But I agree had the original 78 been fitted with a 325 hp plus engine the Dentists' wifes would have been terrified....Holbert could have done his world speed record ten years earlier ! Faced with the "energy crisis" Porsche flinched and the rest is history.