928 4.5 engine design?
#16
Three Wheelin'
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Initially they planned a 5.0L 16V with 300hp.... but the fuel crisis and soft economy of the time made the 4.5L 240hp engine come out....they talked about a 3.?L with 180hp too... I think the 300hp engine would have saved the 928....it would have outperformed the 911 by such a wide margin it might have succeeded in becoming the Porsche of the future it was intended to be....
In 1977 the common thinking was the energy crisis was only temporary. No one thought oil would be in short supply for the next 30+ years.
#17
Nordschleife Master
Porsche has a long history of bringing out a new model with the least amount of HP they think will sell, then slowly over many model years bump the Hp up to sell new cars.
MPG I think was a concern to all brands, the 928 got zapped with something like $3k of gas guzzler tax by 1995.
MPG I think was a concern to all brands, the 928 got zapped with something like $3k of gas guzzler tax by 1995.
#18
Rennlist Member
I hate to brake it to all, but aluminium goes way back as material used to make engine blocks and heads...
The Russians used it in 1931 in their V2 diesel - 38ltr, V12 diesel engine, with DOHC, 4-valves per cylinder and outputs between 450Bhp and 750Bhp...
That engine had liners btw...
The Russians used it in 1931 in their V2 diesel - 38ltr, V12 diesel engine, with DOHC, 4-valves per cylinder and outputs between 450Bhp and 750Bhp...
That engine had liners btw...
#19
Drifting
I do not think Porsche had much consideration for fuel economy considering the 78 4.5 CIS engine got about 8 MPG and on the road maybe 14 MPG.
In 1977 the common thinking was the energy crisis was only temporary. No one thought oil would be in short supply for the next 30+ years.
In 1977 the common thinking was the energy crisis was only temporary. No one thought oil would be in short supply for the next 30+ years.
#20
Three Wheelin'
wasn't it supposed to be way more that 4.5 litter in the beginning, more like 400hp 6.0 litter, but fuel prices caused them to reduce the displacement to 4.5?
The only major thing that is not Porsche is the automatic transmission that was made by Mercedes, good transmissions....
The only major thing that is not Porsche is the automatic transmission that was made by Mercedes, good transmissions....
LOL
#21
Race Car
Yes, as an earlier poster has described, all 911 engines are derivatives of the VW beetle engine which were in fact stolen designs of the T97 by Ferdinand Porsche from Hans Ledwinka of Tatra. This fact was pretty easily squashed by Germany in World War 2 so not many people actually know about it. Here's a good quote from Ferdinand:
Porsche admitted "Well, sometimes I looked over his shoulder and sometimes he looked over mine" while designing the Volkswagen.
The T97 was released in 1936, the VW beetle in 1938, although the beetle seemed to be more of a copy of the V570 prototype that was completed by 1933.
The 928 V8 engine is one of the only engines that was built by Porsche from scratch, making it one of the "purest" Porsche engines. Whenever someone claims anything about Porsche models and their relative "purity", I just laugh.
Dan
'91 928GT S/C 475hp/460lb.ft
Porsche admitted "Well, sometimes I looked over his shoulder and sometimes he looked over mine" while designing the Volkswagen.
The T97 was released in 1936, the VW beetle in 1938, although the beetle seemed to be more of a copy of the V570 prototype that was completed by 1933.
The 928 V8 engine is one of the only engines that was built by Porsche from scratch, making it one of the "purest" Porsche engines. Whenever someone claims anything about Porsche models and their relative "purity", I just laugh.
Dan
'91 928GT S/C 475hp/460lb.ft
#23
Nordschleife Master
By the 70's every brand in the world had picked over every other brands technology. What I thought was curious is how the Ford mod motor followed on some ideas of the 928 motor.
OTOH where would the 928 be without the technology from the 1963 Pontiac Tempest?
OTOH where would the 928 be without the technology from the 1963 Pontiac Tempest?
#24
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Imagine the shock of new owners recieving this pitch to be hit with a $1200 bill for the first maintence.
The 78 and 79 cars never made any compromises to gas mileage. That occurred with the 80 US model when they went to the rabbit fuel injection and detuned the engine in an attempt to capture the lucritive dentist wife's market. The 78-79 cars did well to get 14 mpg on the road - of course that did not matter if you drove 55 or 85. The 80 bumped up mileage to over 20. Of course that was followed by an 85 MPH speedometer.
#25
I would be interested to read what knowledgeable folks have to say about comparing the 928 engine design to other common V-8 designs, for instance the ubiquitous small-block Chevy, and various other well-known V-8s....
Thanks.
Thanks.
#27
Jim has a nice article by Road and Track archived on his site (928Classics) that touches on the American influences used while building the 4.5 engine. I'd post a link to Jim article...but I do not have his premission.
Somewhere, on the internet, I read another magazine article, where they'd mention Chrysler and GM quite often and their influences.
As far as l can remember...neither article I've read...mention anything about Audi.
EDIT: Here are a couple articles about the history of the 928. One is the Road and Track I mentioned earlier and the other is something I just ran across. The second link mentions Audi's engine design being "thought about"...but quickly dismissed by Porsche.
https://drive.google.com/file/d/0B97...t?pref=2&pli=1
https://en.m.wikipedia.org/wiki/Porsche_928
Brian.
Somewhere, on the internet, I read another magazine article, where they'd mention Chrysler and GM quite often and their influences.
As far as l can remember...neither article I've read...mention anything about Audi.
EDIT: Here are a couple articles about the history of the 928. One is the Road and Track I mentioned earlier and the other is something I just ran across. The second link mentions Audi's engine design being "thought about"...but quickly dismissed by Porsche.
https://drive.google.com/file/d/0B97...t?pref=2&pli=1
https://en.m.wikipedia.org/wiki/Porsche_928
Brian.
Last edited by The Deputy; 07-02-2016 at 02:52 PM.