Stan.Shaw@Excell.Net

Gary,

I investigated keeping the CIS if I increased hp and was told 400 was about as much as could be supported. I was advised to go away from CIS if I was to exceed that.

GaryJ

Stan,

I notice that 928 Motorsports has a CIS Fuel distributor and Warm Up unit with 30% more flow. I wonder if that would work. Are you familiar with these at all?



Gary

Stan.Shaw@Excell.Net

Sorry, I am not. Carl at 928 Motorsports would know much more about this than I. Presumably he has developed those parts for his SC setup.

Normy

Not bad idea, a stroker. I wonder about "back pocket" horsepower though. How much is there to be gained by just porting and polishing the heads?

N

Stan.Shaw@Excell.Net

Normy,

Ummm, what?

hacker-pschorr

Classic!!

GaryJ

Thanks Stan:

I'll Check with Carl.

Gary

GaryJ

Hi Sterling:

You are probably correct and it will cost more that I think but remember that the engine is being built already so bearings, gaskets, rings, and probably even pistons are already in the budget so I am thinking just the incremental extra cost will bee less that the 7.5K

Right now I am just exploring if it is possible or advisable to try and put a stroker crank in a 16V 5L and if it will work with my CIS system, plus I am wondering if anyone knows what type of performance gain I should expect by adding the Stroker. If it seems workable and offers a decent performance gain I will narrow in on the actual numbers.

Gary

John Veninger

A standard stroker in a 32V 928S4 usually produces tons of TQ and about 370RWHP using stock intake, ignition and heads.
I don't think your going to like the results after spending all that money on a 2V motor.

GaryJ

Thanks John:

It looks like you would know. I clicked on your signature for the 1980 6.4L car and came up with your 5.0L EuroS race car which is similar to the build I was originally going to do. It looks like you are going to 6.4 so it seems you have decided to add a stroker at some point. How are you going to do this in the older style shark?

Also this is just exploratory, since I am about to build the engine I was just checking to see if I could and what would be gained by adding a stroker crank to the build. This is not going to be a racer it is going to be a fun day out and track day car.

I know it would probably be a lot easier for me to buy a different car but I have a strong attachment to this car and want to maximize the potential of this particular car.

Thanks again.

Gary

Stan.Shaw@Excell.Net

JV's car is a race car, so he has replaced everything, there isn't anything left of the original 4.7L or even the hybrid 5L at this point. The chassis is largely irrelevant at this point, other than the belief that it is lighter than an S4 chassis.

The 5L hyrbid motor that was in JV's car, DL's car and mine were all very similar. We all ran Euro S heads, intakes and CIS, with modified '85-'86 shortblocks. The shortblocks had drilled cranks and pistons with valve reliefs flycut in them to accomodate the Euro S large 2 valve heads. JV had a different set of cams. You could run that setup on the street and perhaps get the @300rwhp, but you may need to run 100 octane fuel with @33' of timing to do so, not to mention a race exhaust.

JV is definitely more knowledgible than I am on this, but I don't think there are any secrets in the 5L hyrbid builds. Others, like MK, have also built them.

John Veninger

https://rennlist.com/forums/928-forum/311809-jv-stroker-motor-dyno-tuned.html

Stan.Shaw@Excell.Net

hey that link looks really familiar

John Veninger

Yea, someone knows I don't like to start those kind of threads

GaryJ

Thanks guys:

Looks like I should just make myself happy with a normal 5L hybrid. It should be a pretty fun car with the 2.75 rear end.

I just didn't want to leave anything on the table that could have made the build really special.

At the end of the day this is intended to be a fun car not a race car.

Thanks again for your thoughts.

Gary