mark kibort

Well, we all probably wanted to see just what a displacement change would do to net rear wheel hp, and here are the test results.

Nothing changed, except a 300cc change in displacement. (well, almost nothing changed. We also have the proper offsets on the pistons due to the valve pocket positioning on the 4 valve pistons, thanks to Greg Brown's advice)

295rw Torque
and
290rw HP

peak HP happens at 5000 to 5500rpm and falls off very slowly. ran up to 6200rpm. Nice arc'ing curve. Air Fuel ratio is dead on 12:1 all the way to near redline where it starts to lean to 12.5:1. Ill post it if anyone is interested.

so, 300ccs of displacement is worth a solid 40hp.

mk

hacker-pschorr

So to recap, this motor has EuroS heads, intake, cams, headers & 5.0 block. What is the CR?

IcemanG17

MK
What did it dyno at with the standard 4.7L.....250whp....... Is it a true euro motor..... I think RichS full 4.7L euro motor dyno'd at about 265whp totally stock with S4 cats....

Drewster67

40 at the wheels or at the crank?

mark kibort

Yes, this is the configuration.

its Ljet US 1984 injection . basically a stock 1984 US with the euro stuff on top of a 5 liter bottomend.
CR is calculated to be near 10:1. maybe slightly higher due to the .010" shaved off the block

Mk

mark kibort

at the rear wheels!

Mk

mark kibort

Thats a good number. I think i heard that JL had about 275rwhp with his pure euro with a set of headers and near open exhaust.

the standard 4.7 did 250rwhp, but the timing was WAY retarded. didnt figure that out until later. basically it was almost 15 degrees retarded . It felt faster when we fixed it, so maybe we were at 260rwhp with the 4.7Leuro bottom end ? its an unknown.

There is one difference between my 5 liter US Ljet euro and scots. he has the B1 cams and i had '82 euro cams, i had equal length headers, he has MSDS. I had 3.5" exhaust from the Y pipe back, he has 3". other than those few details, they are near the same engine. 293 vs 290rwhp on their first dyno runs. (but mine had 700miles on it, and scot's had 50)

mk

IcemanG17

The engine should loosen up a bit and gain some HP too.......what does scots car weigh??? It should be pretty close to the old holbert car now!

mark kibort

He is pretty close to my old 5 liter part euro. actually, we could be very close now. he is still 4 seconds back at Laguna. with 40hp more, and not having to watch his water temps every few seconds, he could be at least a couple of seconds faster. Dont think it will be as fast as the holbert machine, but certainly will give the other guys a reality check this season!!!

cant wait to tell them them, this was a sub $4k engine transplant for 350flywheel hp!

we just found some cruise control stuff under his fender (ie 5lbs) when we were pulling it. now, he is down to near 2685lbs with no driver.

mk

IcemanG17

MK
The other race guys must hate you & scott.....drive an 20 year old car to the track on REALLY old tires.......kick thier butts....pile all your junk into the same car (with even older tires) and drive home.....

mark kibort

I think they are really going to hate scot. My car has been viewed as something special, but Scot's is just an old junker '82, bascially abandoned. the 25 year old car cost $2000.
buys a euro motor for $2k, converts it to a 5 liter $3k and bolts on a $700 eibach/koni suspension, cuts the springs with a grinder, $500 used headers, adds a set of $2500 wheels the free sets tires from the garbage.
2k car
2k euro 928intl engine
3k 5 liter conversion for 350flywheel hp
3k bolt on race stuff. (ie headers, suspension, seat, belts cage, $70 alignment)
2.5kwheels and tires
_____
There you have it. Sub $13k race car that can do probaby near 1:41 at laguna right now.
I dont think you can do this with ANY other car in the world.

Mk

FlyingDog

We all know you like to use the 'new math' but how is $2k+$3k<$4k?

mark kibort

5 liter conversion was 3k. i threw in an extra 1k if someone didnt do all the work we did. take a stock 928. buy a 5 liter short block for $1500. just re ring it and cut the valve reliefs. with head gaskets, you in for another $1000. Now, buy the euro intake and heads for about 1500 (i did) and there is your $4k, just done a little differntly. Plus, you can sell the previous engine or maybe even just the shortblock for $500.

mk

Rick Carter

So 40 extra rwhp from 18 more cubic inches? Just maybe the power came from somethng other just the additional displacement. It would be nice to add more than 2 hp per additional ci.

hacker-pschorr

The previous 4.7 liter was putting out 53hp per liter. The new 5.0 is putting out 58hp per liter.