GaryJ

Hi All:

My winter project is to have a 5.0L Euro S motor built for my 79 5 speed, Since this is pretty much a start over engine build I was wondering if it made any sense to put a stroker crank in this engine.

What could I potentially gain?

Could my CIS keep up? (I do have the Euro S induction)

Could the heads keep up?

Any thoughts you have would be welcome.

Thanks,

Gary

hacker-pschorr

What will this car be used for? Club Racing, DE, street use, garage queen etc...?

Jim bailey - 928 International

Crank rods and pistons equals about $7,500 depending on how you do it. The engine grows by about 30 % but you are correct to question the flow capability of the heads cams and fuel delivery of the CIS. Mark Anderson's 2 valve race engines maxed out at about 425 HP as I recall that was with bigger valves .exstensive head work, race cams, as a 5 liter. I would not recommend spending that much money on a 2 valve project given the limitations of the heads. The east coast racers were seeing about 300 RWHP out of their 5 liter hybrids so 345 or so crank horsepower. Trying to get another 100 hp out of a stroker is going to cost maybe $7,500 MORE ...

John Veninger

Run the EuroS 5.0L with a nice exhaust and have fun with a 350hp engine. It's the best HP to $$ ratio.

GaryJ

Hi Hacker:

It will be a street and DE car, definitely not a daily driver mostly for mountain runs and days at the track.


Gary

GaryJ

Hi Jim:

Thanks for your thoughts. I’m looking at it like this. I was thinking about maybe a supercharger in the future but I don’t think that is an option with the higher compression of the Hybrid motor. So I was thinking for less than the cost of a supercharger kit alone I could get a similar benefit. I think I can do a little better than $7500 for the parts, from then on the work should be pretty much the same. I don’t think I want to get into changing the Fuel Injection system though, I like the idea of a simple CIS system.

Gary

GaryJ

Hi John:

That was my original plan but I was just thinking where I could take it. As I was saying before I had thought about a possible SC in the future but that isn’t going to happen now. If it is another 5-7K and yields another 100 HP that is actually more economical than where I am now, building a Hybrid motor for a little more than a 100 HP gain over my stock motor. The heads, cams, induction, headers, exhaust system, and engine build will cost me way more than 5-7K for the first 100 HP gain. So if I really can get another 100 HP it might be worth it. I don’t know if the extra money would buy me anything close to another 100 HP. Since I am just about to get underway with this project I just wanted to check out all my options.

Gary

Stan.Shaw@Excell.Net

Here's an option for a motor build like JV's:
https://rennlist.com/forums/928-forum/306880-want-offers-on-stroker-motor-build-part.html

hacker-pschorr

What 5.0 are you using? 85-86 or S4? The compression ratio is a bit different between the two.

I'm building an S4 lower end with US heads, 78-79 cams with Euro S intake / TB. I'm dumping the CIS for a 3rd party EFI. I'm shooting for 8:1 compression ratio at about 14 pounds of boost.

Lean-Louis is running 6psi on a 10.4:1 compression Euro engine with no issues. Power is in the ballpark of 370rwhp on a 4.7 liter. As long as you keep the intake temps under control and have enough fuel. High compression and boost is not a problem.

Stan.Shaw@Excell.Net

If you want to build a hybrid motor, please let me know I might have parts for you from my last motor.

GaryJ

Thanks Stan:

I will definitely consider some of your components but I still need to decide if it makes sense to go that route or not

Gary

GaryJ

Hi Hacker:

I am using an 85 block so I should yield about 10.5:1.

I still like the idea of keeping the simple CIS if I can.

Also if I can get the similar HP with the stroker as a SC I am thinking I might have a more stable car by putting the stroker in now and being done with it.

Gary

GaryJ

Thanks again Stan, I will definitley keep you in mind.

Gary

Stan.Shaw@Excell.Net

When I investigated staying with the Euro S heads, intake and CIS, I was advised that it could not support over 400hp. I started with a Euro S motor at 266hp and went to a 86 shortblock with fly cut pistons and ended up with less than 20 more hp. I was still running a more restrictive exhaust than JV and DL who broke the 300hp barrier (at the rear wheels).

GaryJ

Stan:

So are you saying that the Euro S top end, stroker, and CIS could support 400 HP? My change is going to be much more dramatic than your 20, I am currently at pretty much stock 79 US power.

Gary