Hybrid Discussion
12-16-2015, 11:00 AM
#16
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Thank you to everyone answering my question. From looking at the discussion so far, I should start looking for a 5l 85-86 short block and have a machine shop line up.
I may be looking at maybe 275-290 rwhp with proper flow exhaust? That will be ~30 hp above a stock euro s CIS 4.7l?
Ps-mark, I take it the y pipe with free flow catalytic converter will not work for a 85-86 short block? Would it?
Thanks
I may be looking at maybe 275-290 rwhp with proper flow exhaust? That will be ~30 hp above a stock euro s CIS 4.7l?
Ps-mark, I take it the y pipe with free flow catalytic converter will not work for a 85-86 short block? Would it?
Thanks
12-16-2015, 12:37 PM
#17
Nordschleife Master
My Euro S 85 uses a simple Y, magnaflow cat, and single exhaust without issue. Dual exhausts have some minor advantages maybe with tuning, location of the merge, but flow is about cross section area, bigger single pipe vs small dual pipes.
I would suggest using a machine shop that has done the fly cut on a 928 before, and maybe even already has a jig for doing it.
I would suggest using a machine shop that has done the fly cut on a 928 before, and maybe even already has a jig for doing it.
12-16-2015, 01:52 PM
#18
Rennlist Member
Yes, mine does. 284 DJHP a few years back. It may be more, now.
You've gotta compare straight-up. For JUST the displacement adder, it'll be ~30BHP. A bigger engine will add to the value of exhaust mods or porting and other air-flow improvements because it's nearing the limit of what the stock engine has. It's simple mat, really, as the key to engine output is volumetric efficiency.
You've gotta compare straight-up. For JUST the displacement adder, it'll be ~30BHP. A bigger engine will add to the value of exhaust mods or porting and other air-flow improvements because it's nearing the limit of what the stock engine has. It's simple mat, really, as the key to engine output is volumetric efficiency.
250rwhp. the problem is, it had the AFM (fuel was dead nuts on 12:5:1).
adding ONLY the displacement, we gained 40hp.. no other changes..... none.
Mk
What I've always heard is that the stock Euro S bore limits the intake valve flow due to shrouding, which is reduced with the larger bore of the 5.0L, and results were consistently more on the 45 rwhp side than 30 rwhp predicted from just increased volume.
Regardless of which end it is, where are you going to get 30 rwhp for the cost of a 85/86 short block and $400 in machine work? Porsche doesn't have a lot of low hanging fruit, pick all you can.
Regardless of which end it is, where are you going to get 30 rwhp for the cost of a 85/86 short block and $400 in machine work? Porsche doesn't have a lot of low hanging fruit, pick all you can.