O-Ringing an inlet manifold gasket.

**takai** · 23-01-2007, 04:30 PM

I was more thinking stuff like the Vs and FFs which use 3 piece cast alloy manifolds.

The main weight in the unit comes from the air scoop which hangs off the end of the entire assembly. On the FA car i saw while i was in the US it wasnt braced to the body because they were worried about it cracking if another competitor rubbed it or the body kissed a kerb.
Anyway this is way OT.

This gives a better idea of the size of the manifold (and you can see that there definately arn't any extra studs in the head)

and some more Atlantic poon-tang

**myne** · 23-01-2007, 06:17 PM

I'm not sure if it's been covered yet, but have you considered a series of scratches as reciever groves?

What I mean is, grab a standard compass and scratch a series of 2-3 small concentric rings around the port face.
Combo that with the teflon, and it should provide enough surface variation to grip properly.

**30psi 4agte** · 24-01-2007, 02:05 AM

off subject slightly here but are those heads actually cast differently or are they just drilled and tapped to accept that style of r/c with all the extra bolts ???

**30psi 4agte** · 24-01-2007, 04:10 AM

Playing around on ebay i found this:

http://cgi.ebay.com/ebaymotors/ws/eB...8514538&rd=1,1

Not sure what it is made of ?? Have sent the bloke an email to ask him. Looks like it could be teflon or similar.

Dont know about a 5% increase in power from changing a gasket ? bah haaaaa haa

What ever !!! . I guess there is some merrit there.

Does this mean f i change all my gaskets to this stuff i could get a possible 50% increase

They must be made of some good shit !!

**takai** · 24-01-2007, 07:32 AM

Originally Posted by 30psi 4agte

off subject slightly here but are those heads actually cast differently or are they just drilled and tapped to accept that style of r/c with all the extra bolts ???

The Formula Atlantic heads which Hasselgren use are stock from factory before they get them. I believe that there is a stipulation in the FA rules about having to use factory available heads, rather than competition castings. They machine the ports way way back, almost to the meat of the head itself, and way past the injector boss. The port is also significantly enlaraged for further airflow.

There arnt actually any extra bolts so far as i know on those heads, all the ones ive seen (including one in the flesh) looked pretty standard bolt location wise.

**30psi 4agte** · 24-01-2007, 08:44 AM

What about all the extra bolt holes/ bolts to hold the R/C on with ???? A std cover uses just four nuts that come from the bolts / studs that hold the cam caps on but these look like bolts all the way around the r/c .

**Ben Wilson** · 24-01-2007, 09:01 AM

I think they might just be the other cam retainers - You can always use the rest of them.

**takai** · 24-01-2007, 11:12 AM

Nah, a bit too far outboard for the cam retainers. They are just drilled and tapped.

**30psi 4agte** · 24-01-2007, 12:08 PM

thought so. That wouldnt leave much of a surface for the gasket to go on then as it is a pretty small surface to begin with. I guess its enough though or TRD would not have done it.

What is the reason for this tpe of R/C ???? I take it that the R/C is used as a stressed member on the formula atlantic cars hence the big bolt holes on the front / top of the R/C .

**Ben Wilson** · 24-01-2007, 12:12 PM

Yeah - Theu use the engine/gearbox as a stressed member so the need more attachment points.

I wonder if they still use a rubber gasket in that instance?

**takai** · 24-01-2007, 01:07 PM

Originally Posted by 30psi 4agte

thought so. That wouldnt leave much of a surface for the gasket to go on then as it is a pretty small surface to begin with. I guess its enough though or TRD would not have done it.

Yeah, i believe they would probably weld reinforce the inside of the valley, as there is a lot of room there where the cam doesnt rotate. Also it looks like its inline with where the cams bolt down anyway so there is a fair bit of meat there.