bakerboy4s
Nurburgring
- Joined
- 6 Jun 2015
- Messages
- 396
Noticed on the job tag it reads 3.6-3.9, presume that's bore reqs and throw of crank shaft limits capacity to 3.7?
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996.1 cab C2 manual
- Thread starter Dammit
- Start date
With the stock engines the bore for the 3.4 and the 3.6 is 96mm (the 3.8 is 99mm IIRC).
On our engines we are running a 100mm bore.
The 3.4 crank has a stroke of 78mm and the 3.6 has a stroke of 82.8mm, with the 3.4 crank in the larger bore turning into a 3.7 (which is what I'm doing) and the 3.6 crank in the larger bore becoming a 3.9 (which Mister Corn is building).
(The 3.8 runs the 3.6/82.8mm stroke crank).
On our engines we are running a 100mm bore.
The 3.4 crank has a stroke of 78mm and the 3.6 has a stroke of 82.8mm, with the 3.4 crank in the larger bore turning into a 3.7 (which is what I'm doing) and the 3.6 crank in the larger bore becoming a 3.9 (which Mister Corn is building).
(The 3.8 runs the 3.6/82.8mm stroke crank).
MisterCorn
Fuji
- Joined
- 8 Jan 2011
- Messages
- 9,411
That one in the photo was a 3.6l block. Here are the three blocks. Two 3.4 to 3.7l concersions and one 3.6 to 3.9l.
MC
bakerboy4s
Nurburgring
- Joined
- 6 Jun 2015
- Messages
- 396
That's kind of what I thought, will it be necessary to mod the combustion chambers to suit the increase in bore size?
Or are the piston heads hollowed ?
Or are the piston heads hollowed ?
bakerboy4s
Nurburgring
- Joined
- 6 Jun 2015
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- 396
Great project look forward to how they perform and your satisfaction with it all.
Presume you guys have a back ground in engine design/ modding?
Presume you guys have a back ground in engine design/ modding?
I've modified one car engine prior to this- but the dirty/easy way, starting with a turbocharged engine and then upgrading the various parts.
Although with that said we did port the head- but that was as 'old-school proper engineering" as we got.
The Porsche engines are very much the purist route to response/revs/power- higher lift cams with longer duration, larger valves, extensive head work, larger displacement, increased compression etc etc.
As such the detail is beyond me- which is why we include a true expert with decades of experience designing and building race winning competition engines in our group of conspirators.
Although with that said we did port the head- but that was as 'old-school proper engineering" as we got.
The Porsche engines are very much the purist route to response/revs/power- higher lift cams with longer duration, larger valves, extensive head work, larger displacement, increased compression etc etc.
As such the detail is beyond me- which is why we include a true expert with decades of experience designing and building race winning competition engines in our group of conspirators.
Also, I have to say Baz of Hartech has been incredible- without his input and insight it would have been extremely difficult to have got to this point.
To be very clear- this is not a Hartech project, if all three engines explode on the Dyno it's 100% down to us, but Baz, Grant and so on deserve huge credit for the help that they have given and if everything does go as planned it will be in large part due to them.
To be very clear- this is not a Hartech project, if all three engines explode on the Dyno it's 100% down to us, but Baz, Grant and so on deserve huge credit for the help that they have given and if everything does go as planned it will be in large part due to them.
Ghianightmare
Montreal
- Joined
- 25 Apr 2017
- Messages
- 608
Fantastic - pure car porn!
bakerboy4s
Nurburgring
- Joined
- 6 Jun 2015
- Messages
- 396
Dammit said:
As you say fantastic of Baz et al to provide support and guidance and the benefit of his experience. Makes me think of my apprentice days!!
I'm always deeply impressed whenever I get the roof rack out, the very chassis of the car was designed to accept the rack, and the rack itself is a beautiful piece of engineering. One of Porsche's engineers clearly wanted to be able to take something with them in their new car - who knows if it was a pair of skis, a canoe or a bike, but I thank them for their work.
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