Is 16V Masi HG same as other 2.2/2.5 HGs?

[Xtrempickup]

I got a Cometic HG at home thats for my 16V masi motor. I wanted to know if the standard HG for a 2.2/2.5 whether commonblock or not was the same. I was thinking if i needed one in a pinch for my TIII that i could use it if needed.

[GLHNSLHT2]

huh? you have a cometic masi gasket, that you want to know if the 8v gasket is the same, so that you can bolt the cometic onto your lotus motor?

[Xtrempickup]

i have a cometic that was from Rick D. I bought it in case I was going to do the HG on the motor. I have a lotus motor im building that also has a cometic and i was going to reuse. to my knowledge the Head gaskets are the same 8v to 16V i thought except crossdrilled vs non i thought. I just wondered if i wanted to use the one i bought for the masi on the lotus would it work. since the blocks are the same i figured the head gaskets are also the same

[4 l-bodies]

Tom,
No there are differences. Most notably the center oil drain is blocked off on the lotus HG. Water jacket holes are in different locations too. See pics.
Cometic is Masi gasket in both photos.
Todd

[Xtrempickup]

interesting thats good to know, thanks

[GLHNSLHT2]

the size of the specific holes determin where the coolant flows. Interesting to see how the different heads like different coolant paths. Take a look at a Neon gasket. You can see how they get the coolant to flow from one side to the other and back. Great pics Todd!

[rbryant]

the size of the specific holes determin where the coolant flows. Interesting to see how the different heads like different coolant paths. Take a look at a Neon gasket. You can see how they get the coolant to flow from one side to the other and back. Great pics Todd!

My 2.4 build talks about this a bit.

I ended up having Cometic make me a custom HG for my 2.4 because I changed the water outlet to be on the #4 cyl.

http://www.turbo-mopar.com/forums/sh...=444636&page=2

The Masi head has the outlet between #2 and #3 cyles so it is still a little different than the 8V (non Masi owners can see it if you look closely in the picture below).

The Lotus head coolant outlet is on the #4 cyl. I am not really sure which flow holes would be more correct for the Masi head where all of the coolant has to come out of the middle of the head. It actually looks like the Masi gasket is basically the same as the 8V gasket except for the one hole which I think is an oil feed? The cooling holes are a little smaller in the 8V gasket but not that much except for the front side intake valve cooling which is the least important.

Both gaskets are actually pretty much the same functionally. The Masi head seems to have the front oil return hole in it. If it didn't the head would just seal against the gasket anyway as long as the embossing is high around extra holes and the head is flat there they will just be sealed. Assuming that the Masi head drains out of the other two front holes it should be just fine with either gasket.

Here is an old picture that Alan posted a while back showing the Masi and Lotus heads side by side. He should have put in a lowly 8V head to so we could all compare them.... Anyway it is still a great shot for this thread.


I am surprised that the Masi gasket has only one exhaust valve cooling hole but it keeps the same basic setup as the 8V head that only had one exhaust valve to cool... That might be explain why the Masi head has a notch to connect its exhaust valve cooling holes. I really expected it to have a hole for each valve like the Lotus and 2.0 heads but the SRT4 head also does that except on the opposite valve compared to the Masi gasket... I guess they just relied on cooling hole between the bores to cool the valve.

Anyway my conclusion is: Don't use an 006 gasket with the DOHC heads. It wouldn't cool the second exhaust valve because the center bore cooling passage is removed on it.

picture of 006 stolen from TU:


I would like to see a factory Masi head gasket to see if it matches the cometic one exactly or not.

[GLHNSLHT2]

I have one, I'll try and snap some pics. I would always run the correct gasket to the head.

[rbryant]

I have one, I'll try and snap some pics. I would always run the correct gasket to the head.

Thanks.

I edited my post a few times to hopefully it makes more sense now...

Head coolant flow is really interesting to me for some reason...

-Rich

[2.216VTurbo]

Since you already have one surgical wrap shot in this thread Rich...

[GLHNSLHT2]

my interpetation is that because it comes out one hole it will swirl the coolant and cool both valves anyway. Just like some holes are smaller on the T3 and the 2.0/2.4 gasket It restricts or allows more coolant in certain area's to have the flow travel a certain way.

[rbryant]

Since you already have one surgical wrap shot in this thread Rich...

Cool looks identical.

I wonder why they put such a big hole on the front cooling... It seems like 2 holes on the outer edges like the other gaskets would work the same.

It is also strange that they did one big cooling port on only one of the exhaust valves...

I guess that is a question for the experts that designed it.

Thanks for the pictures and the one that I reposted.

-Rich

[Xtrempickup]

cool, this thread was useful