Stopping the knock: Lower compression and ported heads...

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I know you have to do, what you have to do. I guess I've just been out of this game too long. Still, I find it sad that you have to go in the 9's on compression to run pump premium while running a cam that stout. Guess I wont have to worry about it unless I hit the lottery...lol.

But I still wonder.....
[ame="http://www.youtube.com/watch?v=2h3PAIrthTc"]Buford T Justice - YouTube[/ame]

Just funning here guys :D.................................................^^^^^^^^^^^.
 
The thing is, the Lunati cam actually makes more cylinder pressure than the MP '509. It isn't just a matter of the static compression.
The machinist did the cleaning, resurfacing and the valve job. He had a specialist do the porting.
I was told that the valve stem seals were off on 2 of the intake valves. I didn't notice that when I changed the springs. The guides were all fine, but with seals not totally covering the ends of those two guides, maybe some oil was being drawn in. There was gunk on every piston, some were a little more than others. I still say that I didn't see or small any oil burning, but I may be wrong there. One Intake seat was out of round even though cranking compression was fine. It was corrected during the valve job. The porter gasket matched the huge 2" TTI header gaskets. The intake ports were not changed much, he chose to focus on the inner part of the intake ports.
 

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I love shiny clean parts!
 

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This was the first time I have ever had heads ported. I paid $750 to have the heads cleaned, the valve job with new stem seals, light resurfacing, port work and measured for cc's.
 

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805moparkid said:
lol who ported that head?
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I deal with Vic's Harbor machine in West Sacramento. Rick is the main machinist. He had a guy at another shop do the porting, Rick did the rest.
I trust Rick to do the best work he can and he hasn't let me down yet. As far as porting, just as I was ready to have the heads ported, I finally got back to work. I didn't have the time or ability to ship them out of state to the big names in the Mopar hobby. I heard great things about Jeff at Modern Cylinder head, Dwayne Porter and Jim Laroy but Vic's shop is along my commute.
 
txstang84 said:
No doubt

And yes-reverify the cam...maybe even retard it a couple or few degrees...
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i agree re degree the cam. now to be fair to the OP you should add only in reference to the lobe centerline, not what the gears say as they are known to be all over the place...

Op degree is as it sits so we know where it is, then we can go from there
 
That's where I was going-he said he degreed it using the ICL method, and that perhaps it was off; but I offered that retarding the cam timing might help with the lowering the increased cylinder pressure and could help his detonation issues.
 
Zombie Ray Charles?
I did see that the 2 center exhaust ports looked a little out of square. Other than that, why the insults?
I am new to this stuff. Sorry ....
 
805moparkid said:
i agree re degree the cam. now to be fair to the OP you should add only in reference to the lobe centerline, not what the gears say as they are known to be all over the place...

Op degree is as it sits so we know where it is, then we can go from there
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Makes sense. I'm thinking about buying a deck bridge to do it with the heads off.

I decided to go with the .075 Cometics. Being at 10.0 to one with the other changes should be enough. I am buying new head bolts for cheap insurance.
 
txstang84 said:
That's where I was going-he said he degreed it using the ICL method, and that perhaps it was off; but I offered that retarding the cam timing might help with the lowering the increased cylinder pressure and could help his detonation issues.
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no i understand where you were going, we just dont know where we are which can help!

Frankenduster said:
Zombie Ray Charles?
I did see that the 2 center exhaust ports looked a little out of square. Other than that, why the insults? No need to be a dick about it.
A guy asks for help, gets some good advice and some BAD advice....
The guy takes what seemed like good advice that turned out to be a big step backward, yet never blames the guy that gave him the advice.
Sound familiar?
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Has nothing to do about it... its the fact you paid your hard earned money and got a (from the couple of pics) a marginal port job. From you pics the ports were opened up at the mouth but pinch not far into the port, from the same pics it looks like you can see the cut line from the seat cutter. it takes a couple of minutes per port to just blend the bowl and they didn't do it (at least from your pics it dosn't look like it.

Then you said they didn't do much on the intake side which is pretty obvious. the guides and humps are pretty much untouched, hard to tell without before/after pics and a gasket whether he port matched the intakes or did and bowl work.

Rusty, Tx, and myself mean nothing personal, but i would break the heads down and start running you finger thru the ports. If its not all nice and smooth, ( no burr marks from the cutters, but only fine scratch from the sanding roll), then i would pack them up and say do a good job or by be another st of heads because you fucked these up... IMO (not saying they cant be fixed, just need CORRECT porting)

We really want this fixed for you!
 
famous bob said:
you got too much clearance in your squish area! get it down to about .040---------------------------:coffee2:---bob
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CPMotorworks said:
Was the block honed with a torque plate?
Looks like it may be sucking some oil thru the guides too.
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I agree with these 2 statements. Seems like an awful lot of oil carbon on those piston tops......getting it from somewhere.
 
As I wrote, I have next to zero experience with head porting.
The ports are pretty smooth inside. They had a natural texture of cast aluminum before. I am kicking myself for not taking any "before" pictures because I usually do.
A guy on DodgeCharger.com mentioned an idea that never occurred to me: having the chambers opened up to 90 ccs and using a thinner gasket. His idea was that I'd get better quench yet also lower the CR. Now I am second guessing my plan. I am tired of making mistakes. I'd be willing to dig deeper to have these chambers opened up more if it were possible.
Have you heard of this?
 
Frankenduster said:
As I wrote, I have next to zero experience with head porting.
The ports are pretty smooth inside. They had a natural texture of cast aluminum before. I am kicking myself for not taking any "before" pictures because I usually do.
A guy on DodgeCharger.com mentioned an idea that never occurred to me: having the chambers opened up to 90 ccs and using a thinner gasket. His idea was that I'd get better quench yet also lower the CR. Now I am second guessing my plan. I am tired of making mistakes. I'd be willing to dig deeper to have these chambers opened up more if it were possible.
Have you heard of this?
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yea at least a dozen times on your threads... Rusty brought it up at least once
 
Rice Nuker said:
If you open the chambers and run thinner gaskets, couldn't you take advantage of both quench and less compression?
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FIRST POST ON THIS THREAD...

440dartsport said:
I'm running the same stroker as you with a 4.15 stroke using closed chamber Indy EZ heads but I had the bowls opened up to 85cc. Flat top pistons .007" in the hole. .040" MLS head gasket. 38 degrees locked timing. Compression is 10.9 to 1 and .047" quench and it makes 750hp on pump gas. I would listen to these guys when they say to lower the head down and open the chamber up some and you will make more power and should not detonate.
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FIRST PAGE

im not going thru the other 4 pages
 
I made a joke and have been right with you on BOTH this site and FBBO trying to give you advice but get called a prick in PM and a dick on open forum. Yes, my cam recommendation ended up going the other way. I apologized for that and took the blame. A lot of people have given you advice for free. Like I told you in my PM reply, if you wanted a sure thing, you should have hired a professional engine builder. I said I was out once before, but I still tried to come back and help. I'm not doing it again.
 
RustyRatRod said:
I made a joke and have been right with you on BOTH this site and FBBO trying to give you advice but get called a prick in PM and a dick on open forum. Yes, my cam recommendation ended up going the other way. I apologized for that and took the blame. A lot of people have given you advice for free. Like I told you in my PM reply, if you wanted a sure thing, you should have hired a professional engine builder. I said I was out once before, but I still tried to come back and help. I'm not doing it again.
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you are a pro, but without the damn thing infront of you and 100% specs your pissin in the wind...
 
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