danglerb

My assumption is that without adding air flow, changing afr, or timing, little will be gained. Is there something about the factory brain with a sharktune that prevents setting afr and timing to whatever you want?

IcemanG17

since its a pure race engine we can get 100 unleaded and 110 leaded......all are available at the track

keep in mind is pure stand alone.....so the fuel spark are adjustable however needed...

mark kibort

290 rwhp is for Ljet and a good exhaust. (like equal length headers) optimizing fuel and spark is pretty easy to do for the narrow range of use of a race car, that's why the gains are not due to aftermarket ecu's, but with with the other changes like valves and port size as well as cams. (see Dennis' engine results) their optimization of fuel and air mixtures and timing resulted in only about 15hp.

well, proof will be on this engine wont it!???

Looks great Brian!

Mark

mark kibort

if you can get to 12.5 from 5000 to 6400, how much more can you improve power. if you can advance or retard the timing to a good range, what gains can the aftermarket system provide. sure, on the S4, there is no way to adjust the timing, but fuel you can get in a good range with the fuel regs.
I think joe and mark got 520rwhp with the stock ecu stuff!

Landseer

How complicated is building the hydrid engine, 5.0 block with 16V USA or Euro heads?
What is involved? Is it plug / play or are we talking about engine artisan / machinest work?

Ducman82

you have to have the pistons cut for the bigger 16v valves.... other than that, ..... thats it

Dave928S

You can but it will work without a fly cut of the pistons ... it just makes it definitely an interference motor. There is a euro 5 litre hybrid here which has no cuts, which I've visually confirmed with an endoscope, and done front end work on to confirm it's interference. It uses standard head gaskets, is a DD and has been tracked.

Ducman82

^^ neat! that i did not know.... could have saved me a few bucks if i had known that

Dave928S

I was astounded when I looked at the top of those pistons, but that combination of euro top end and 5.0 litre bottom works and can handle a flogging ... I've always wondered how close the valves get though.

BTW .. I never tire of looking at your avatar ...

Landseer

I've got a Euro that needs rings and a spare 86.5 engine.
Maybe a winter project in-the-making.



Titans of the Aeroman-class avatar, you guys are. Exceptional.

T-Rex, Tasmania. Both can take me to a special place.

mark kibort

this is right. pistons don't hit the valves with or with out valve reliefs during normal operation. with the proper euro 85 shallow cuts, the pistons hit the valves at a valve depression of .3" (cam lift is near .45") but this means that the piston has to be at TDC to hit, and if the belt is attached , this never happens unless the belt breaks. the cut outs are only .18" deep, so its only a little safety margin and allows for movement of the cams and crank when belt is not attached.

that's pretty easy to do at a machine shop. I have the dimensions. they alsways seem to get it a little wrong, so I always go in and dremel the smillie faces a little wider to make sure the valves don't hit. (by 1mm usually)

Hmmm, kind of a loaded question as there are different levels of the build. I did the complete euro 5 liter conversion on an Ljet .
pistosn flycut
euro intake mods to adapt to US cold start and microswitches
RRFR
hogging out US Ljet "U" adapter for diameter matching for euro throttle body.

granprixweiss928

is Valley Balancing still the place to go?

RFJ

That can't be just one tho more like 10 thou and John Speak has an after market chip that should add a goodly amount of power with headers.

mark kibort

you can use the machine shop /engine builder in MtView that ive used for many years on all sorts of projects.....Devek used these guys in the beginning.
great for work on any of the 928 components. heads, block (bore refresh or added bore)

Imo000

This is the first time I heard of exhaust valves bending from overheating. Also a first tonhear a 1 thou skimming that removes pitting. I don't think it's even possible to skim a head that little.