Building the supercharger to the engine (75 3.0V6)

Jim K
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Re: Building the supercharger to the engine (75 3.0V6)

Post by Jim K » Tue Oct 02, 2018 7:05 pm

Just measured several sets of used 164 24v gaskets (all in excellent, I would even say reusable shape) and they are all 1.6-1.7mm. I have a new set of special Nava ones still sealed, advertised as 1.6mm thick.

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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Thu Oct 04, 2018 1:19 am

@ Remco:It is fore sure a 12v one since i never owned a 24v.

Finaly found some info on it on the web. There are 1.8 and 1.7 one's according to this site:
https://www.auto-onderdelen24.nl/alfa-r ... koppakking
Think the 1.8mm ones are for a skimmed head so i think 1.7 is original. 1.7 are the Reinz one's.

I tried to measure between the head an blok on the car. I was getting a reading of 1.8mm but it was a bit tricky...
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Thu Oct 04, 2018 1:21 am

Thanks Jim!
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Mon Jun 24, 2019 12:32 pm

I pulled the engine because I want to built in a baffle plate in the sump. Checked the crank when I was at it. Had it regrind.All bearings which where good stayed nice. The bad ones got worse.

Also the pistons which where coated gone bad. Coating was gone. All aftermarket and NOS piston and liner sets which I ordered where of very low quality.
0.1mm piston to liner clearance with some and 0.02mm ovalization and taper error or more.... sent them al back.

Now I'm exploring forgies. Some have a quench area but built for high comp ratio. I want about 8.8:1 to 9:1 so I need custom made ones.
Paul Spreull for example has high com ones with what is looks like a quench area:

Image

I think it is nice with for me a disch in the middle to compensate cr. What do you guys think?
How much head to piston clearance should the quench area have..?
Tough questions I think.

Wossner does the same it looks like:

Image
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Mon Jun 24, 2019 12:33 pm

I pulled the engine because I want to built in a baffle plate in the sump. Checked the crank when I was at it. Had it regrind.All bearings which where good stayed nice. The bad ones got worse.

Also the pistons which where coated gone bad. Coating was gone. All aftermarket and NOS piston and liner sets which I ordered where of very low quality.
0.1mm piston to liner clearance with some and 0.02mm ovalization and taper error or more.... sent them al back.

Now I'm exploring forgies. Some have a quench area but built for high comp ratio. I want about 8.8:1 to 9:1 so I need custom made ones.
Paul Spreull for example has high comp ones with what is looks like a quench area:

http://www.spruellmotorsport.com/piston ... -5301.html

I think it is nice with for me a disch in the middle to compensate cr. What do you guys think?
How much head to piston clearance should the quench area have..?
Tough questions I think.

Wossner does the same it looks like:

https://lh3.googleusercontent.com/--_D7 ... C_0277.JPG
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Fri Aug 23, 2019 5:37 am

Image

Nice stuff 8) 9:1 cr
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Tue Oct 22, 2019 3:09 am

....
Last edited by gtv-racer on Tue Oct 22, 2019 11:22 am, edited 1 time in total.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Tue Oct 22, 2019 3:10 am

Made a ring grinder for nice parallel slots:

Image

Assembled the piston assembly:

Image

Lathe down the flywheel:

Image


Also assembled the the crank and rotating assembly
Minor progress but I hope things speed up now.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by KevinR » Wed Oct 23, 2019 12:31 pm

Nothing like a new set of Pistons . What prop set up did you run with ?
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Re: Building the supercharger to the engine (75 3.0V6)

Post by Giuliettaevo2 » Thu Oct 24, 2019 10:16 pm

Clever tool for the rings. :P
Drive it like you stole it...
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Sun Oct 27, 2019 10:03 am

OEM prob setup with BMW middle donut. Never had an issue with it while drifting and racing it.
Hope this isn't going to be an issue with the new low comp pistons..
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Tue Nov 12, 2019 4:35 am

Made a sumb baffle plate :

Image

Image

Some engine assembly pictures. Race baffle also installed.

What crossed my mind is that i know a guy who retarded cam timing on his 75 super charged 3.0 with 6 degrees. He gained approx 60 hp. I think idle in my setup is gonna be the problem because it's already very hard to tune.

That make me think of variable cam timing. Is there some out there who did the same?
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Tue Nov 12, 2019 4:36 am

Made a sumb baffle plate :

Image

Image

Some engine assembly pictures. Race baffle also installed.

What crossed my mind is that i know a guy who retarded cam timing on his 75 super charged 3.0 with 6 degrees. He gained approx 60 hp. I think idle in my setup is gonna be the problem because it's already very hard to tune.

That make me think of variable cam timing. Is there some out there who did the same?
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Re: Building the supercharger to the engine (75 3.0V6)

Post by 75evo » Tue Nov 12, 2019 6:36 pm

Whose supercharged 75? Is it the red one from Norway or the one Mende (DK) built and sold to someone in Taiwan?

Why would idle be difficult for your car? Aren't your cams mild?
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Wed Nov 13, 2019 1:30 pm

I have high lift cams in it.

Here's a peace of the thread of Hans Bjurman:

:) Hi ..
I am Hans.. the Swede with the sc Alfa V6 ..

I´ts nice to se that you are interested in my car ...

I done some racing in the Swedish Alfa Challenge for some years now with an 75 3.0 QV..

I did need more power to keep up the turbos..and build an new engine on an 164 super engine
I did make new intake manifold and headers... 41 mm inside ,, catcam racecams ...cr 11:1 and stock Motronic..

That only got me aprx 220 engine hp.I think the motronic mostly maked the roof..

So I did buy an MegasquirtII and An used sc M62
I did put in an 2.5 crank. and it end up in 2.78 liters and cr aprox. 8.5..

That worked out very good and the engine give me 240 hp on the wheels after one simple dynotest..

Thats the engine thats in the youtubes from last year..

Many experts said that it is not perfect with racecams and overbost ..to much overlap...

So my theory was to back of the cams ..

Last week I did some dynotest and with the cams backed of up to 6 degr ( that max.what I made my adjusthols for) the engine just run perfect and give over 290 rwhp and nice torque..

Thats one part of my racecar story

/Hans

And the link to the thread:

https://www.alfabb.com/threads/290-whee ... rt.178581/
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