Slant Six Forum :: Engine volumes for CR Calculation to match Erson RV15

What's the part number on that head?

I don't think I've seen one with the open cooling passages on the deck side...

-D.Idiot

That's an '81-up hydraulic head. I think they're all like that.

That 13cc dish is really killing you.

Lou

Your valves will not even get close to the pistons. Sounds like a plan...

Lou

Do you think there may be reliablity issues? Normally the head and rest should be as strong for 9:1...

Quote:

Do you think there may be reliablity issues? Normally the head and rest should be as strong for 9:1...

As long as you are shooting for 9:1 it should not be an issue, but if the bores are worn and the rings are high mileage something may give...
If you were shooting for 10:1 then it'd be a yes...but 9:1 isn't too bad.

You will see night and day difference between 8:1 and 9:1...it get's better if your cam is degreed correctly and you dial in the timing...
-D.Idiot

My duser is my daily driver and it's running a much bigger cam with 10:1 comp 100 shot with goodies gets me to school work and anything in between

Kev

Author:	Wizard [ Wed Sep 01, 2010 2:38 pm ]
Post subject:
This is done with liquid measured out into the sealed cavity to get exact CC on each combustion chamber and piston tops. BTW. that piston tops I see looks like those pistons were for turbo 2.2 or turbo 2.5. Cheers, Wizard

Author:	DusterIdiot [ Wed Sep 01, 2010 8:46 pm ]
Post subject:	What the heck?
What's the part number on that head? I don't think I've seen one with the open cooling passages on the deck side... -D.Idiot

Author:	Adrenalin [ Wed Sep 01, 2010 10:51 pm ]
Post subject:	Re: What the heck?
Quote: What's the part number on that head? I don't think I've seen one with the open cooling passages on the deck side... -D.Idiot well I really do not know that and it is currently at the work shop. But I can learn it on saturday and try to inform you. As I said before, it is cast steel head, it is impossible to replace valve seats, they are cast too!!

Author:	Dart270 [ Thu Sep 02, 2010 1:25 am ]
Post subject:
That's an '81-up hydraulic head. I think they're all like that. That 13cc dish is really killing you. Lou

Author:	Adrenalin [ Thu Sep 02, 2010 2:43 am ]
Post subject:
Quote: That's an '81-up hydraulic head. I think they're all like that. That 13cc dish is really killing you. Lou Yes and today I have found no-dish pistons, I will buy them and install. Also try to achieve 48 cc Combustion Chamber volume to get 9:1 CR. I guess this engine is built for 70s turkish market... the petrol quality was horrible. I can understand why chrysler preferred low comp pistons... I hope my valves does not hit to the pistons... In the end I need to shave 0,09" just to get 9:1.. I guess there will be night and day differance in performance...

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Author:	Dart270 [ Thu Sep 02, 2010 7:35 am ]
Post subject:
Your valves will not even get close to the pistons. Sounds like a plan... Lou

Author:	Adrenalin [ Thu Sep 02, 2010 9:53 pm ]
Post subject:
Quote: Your valves will not even get close to the pistons. Sounds like a plan... Lou getting from 8.4:1 to 9:1 does not seem much but from 7.4:1 to 9:1 seems quite a lot. Do you think there may be reliablity issues? Normally the head and rest should be as strong for 9:1... (I hope )

Author:	DusterIdiot [ Thu Sep 02, 2010 10:20 pm ]
Post subject:	Yep.
Quote: Do you think there may be reliablity issues? Normally the head and rest should be as strong for 9:1... As long as you are shooting for 9:1 it should not be an issue, but if the bores are worn and the rings are high mileage something may give... If you were shooting for 10:1 then it'd be a yes...but 9:1 isn't too bad. You will see night and day difference between 8:1 and 9:1...it get's better if your cam is degreed correctly and you dial in the timing... -D.Idiot

Author:	Adrenalin [ Thu Sep 02, 2010 11:44 pm ]
Post subject:	Re: Yep.
Quote: Quote: Do you think there may be reliablity issues? Normally the head and rest should be as strong for 9:1... As long as you are shooting for 9:1 it should not be an issue, but if the bores are worn and the rings are high mileage something may give... If you were shooting for 10:1 then it'd be a yes...but 9:1 isn't too bad. You will see night and day difference between 8:1 and 9:1...it get's better if your cam is degreed correctly and you dial in the timing... -D.Idiot Well, it will be all new rings and pistons so this should not be a problem. I believe that the cam will be ok (I plan no retarding etc) but worried about timing.. if recurve is necessary I am not sure if anyone can do it here... People here dial with recurve if there is pinging.. we'll see

Author:	1974duster kev [ Sat Sep 04, 2010 4:14 pm ]
Post subject:
My duser is my daily driver and it's running a much bigger cam with 10:1 comp 100 shot with goodies gets me to school work and anything in between Kev

Author:	Adrenalin [ Mon Sep 06, 2010 10:38 pm ]
Post subject:
Quote: My duser is my daily driver and it's running a much bigger cam with 10:1 comp 100 shot with goodies gets me to school work and anything in between Kev So not much of a problem than... I feel a little bit worried since it looks I am changing too many things at a time... I wish the pistons were flat... Anyhow I will do it and see.. do you have an idea about your HP of your slant? it is not a match for my slant but it will give an idea..

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