308 Engine Rebuild & CIS to TWM Throttle Bodies Conversion Thread!

excellent . . thanks . . can you zoom in the intake valve seat with a valve that's open? . . I want to see how the guy ground the seat right there?

thanks,

Sean

 

can almost tell in the 2nd pic . . I wanted to see how close the top of the valve seat was to the head gasket surface or if he did anything special there . . .just looks like it's real close as in no way you could fit bigger valves . .. . can you take a high res close up maybe?

cheers

edit: now that I look at it that valve seat looks pretty wide . . take a high res close up . . . shrinking might blurr it though eh? . . .the top of the valve seat should be below the top of the valve face . . . probably is . . just seemed like I had to cut a lot of top angle to get the seat where it needed to be.

 

Sean, a 42mm valve is big enough to flow about 130cfm or roughly 50+ hp worth of air.....that's over 400 hp as is once the port is fixed.....just about the limit of you TBs.

 

man a 308 with 400 naturally aspirated horsepower would be nuts . .. I can tell I'm gonna need a flow bench or I'm gonna go bug the heck out of sleeve Steve. . . now that I'm officialy rid of the injected intake he hated I think he'll be more motivated about me trying to blow up one of his overbore creations .

 

is that before or after he ground the seats? .. .. doesn't look like the top angle has been touched but maybe it didn't need it but I was taught to always kiss it .. . what's important is the top angle of the seat is below the top edge of the valve . .. look how much meat is between the top of the valve seat and edge of the combustion chamber in this pic when the seat is in the right place . . . I had to grind a custom rock to grind the top angle . .. . that's why I like seeing what others do . .. or don't do

too bad the top of the pic clipped it but it seems like if you machine the sealing surface of the 2v heads I've seen you are into the o.d. of the intake valve seat immediately.

cheers
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Build a 3.6 with 360 parts, a 348 heads gasket and properly flowed heads and you'll make 400 naturally aspirated hp at 8500. If you leave it a 3 liter you'll need more revs I think...although the QV sim said 340-350 at 7700 so thats 375-386 at 8500.

I've got less than $500 into my flow bench........

 

any threads on building a flow bench on here yet? . . I'll start one in tech if not . .. maybe Artvonne started one? . . let me know.

cheers.

 

I'm pretty sure Paul had one and mine is somewhere in the first 10 pages of the V12 build I think.

 

Any updates? So far it's lookin' good.

 

No reserve,110 296 215 112, Mason Family sellers

 

with 3 spare carbs to boot, currently at $305; Carbs will need rebuilding but that's not news.

Now if I only had one of those $12K Mondial 8 coupes...

 

Very nice work indeed! He has a CNC?
You're going to Electromotive ignition?

 

SWEEEEEET!

What are you doing Chris? I heard a rumor that you sold the carbs you bought. Are you going EFI now?

 

Very nice!
Now I see why you didn't answer on the Electromotive ignition question as you are going to a central ECU for fuel and spark.

 

WOW! I could've used those a couple months ago.

JIM

 

hmmm, but mine are hand-hammered in best Italian style!
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