|
Re: "Detonation problems" rebuild 440-6
[Re: JohnRR]
#308622
05/06/09 11:17 AM
05/06/09 11:17 AM
|
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
|
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
|
Quote:
Assuming 4.350 bore , stock correct length rods , 7 cc for valve reliefs , .300 down to the top ring , 4.410 bore I get 10.43 ...
Using a steel shim it would have been 10.89 , so I'd have to agree with your local guru a bit on that , but since you might have to mix anyway I would have opted for the higher ratio and good quench , rolled the timing back a little on the street 
cross your fingers 
I can always put the steels in, I have a set on the shelf. I'm goint to start the timing at 35* and go form there.
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: JohnRR]
#308624
05/06/09 02:44 PM
05/06/09 02:44 PM
|
Joined: Jun 2006
Posts: 108
Sweden
6pakdude
OP
member
|
OP
member
Joined: Jun 2006
Posts: 108
Sweden
|
Checked the cylinder pressure after work today. Cold engine 170psi. Is this to muck for my voodoo cam? If so what head gasket should I use to lower the pressure/comp ratio. Have located colder plugs here in Stockholm, I gonna buy a set this weekend, Accel 124 should be one colder step then the champion plug. (I might have the wrong number of the plugs, forgot the note at work. Peter 
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: 6pakdude]
#308625
05/06/09 02:56 PM
05/06/09 02:56 PM
|
Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
|
You have a lot of cylinder pressure there, but not too much. You have no quench, but that should not be an issue. You ned to add fuel, as you suspect. You should get the Pro Max metering plates that will use standard jets to adjust the outboard mixtures. I seem to recall that Euro 98 is about the same as our 93. So it's not octane. i think you're lean as you think. So instead of rebuilding the engine, give it the fuel it wants. You should NOT be running that engine until you figure it out. KBs and pinging are NOT GOOD at all. Also, you should be able to go to the purple springs in your outboard vacuum pods after you get some jet in it. What is you timing curve? You should be around 15° initial, and total around 36° with it all in somewhere around 3K.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: moper]
#308626
05/06/09 03:37 PM
05/06/09 03:37 PM
|
Joined: Jun 2006
Posts: 108
Sweden
6pakdude
OP
member
|
OP
member
Joined: Jun 2006
Posts: 108
Sweden
|
Before I asked this question on moparts. I decided to try to shorten the slots in the distributor. before 2x10 degree, now 2x7. used epoxy so it's easy to remove.
So timing and curve of today is inital 16 w vacum, total 30. full timing comes at 2300 RPM.
Havn't run this combo yet, because of rain ,hopefully this weekend.
I drive the car, but not going over 4500 RPM until problem sorted out.
Yes thats my thoughts to, using those billet plates from ProMax, because of the cost I need to know that it solves my problem.
I have long yellow springs in the vac pods.
Thanks peter
Last edited by 6pakdude; 05/06/09 03:41 PM.
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: moper]
#308627
05/06/09 04:27 PM
05/06/09 04:27 PM
|
Joined: Jan 2003
Posts: 75,047
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,047
U.S.S.A.
|
Quote:
You have a lot of cylinder pressure there, but not too much. You have no quench, but that should not be an issue. You ned to add fuel, as you suspect. You should get the Pro Max metering plates that will use standard jets to adjust the outboard mixtures. I seem to recall that Euro 98 is about the same as our 93. So it's not octane. i think you're lean as you think. So instead of rebuilding the engine, give it the fuel it wants. You should NOT be running that engine until you figure it out. KBs and pinging are NOT GOOD at all. Also, you should be able to go to the purple springs in your outboard vacuum pods after you get some jet in it. What is you timing curve? You should be around 15° initial, and total around 36° with it all in somewhere around 3K.
Dave , I have seen KB spec a max of 34* total ???
Edit I just reread your first post , I'm with moper it sounds like you are too lean .
Last edited by Johnahah; 05/06/09 04:32 PM.
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: 6pakdude]
#308628
05/06/09 04:30 PM
05/06/09 04:30 PM
|
Joined: Jan 2003
Posts: 75,047
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,047
U.S.S.A.
|
Quote:
Yes thats my thoughts to, using those billet plates from ProMax, because of the cost I need to know that it solves my problem.
Thanks peter
Peter , the Pro Max plates allow you to use standard holley jets to change jet size to richen or lean out as needed , right now the plates in those outboards just have a drilled hole , you can drill the hole bigger as needed, but it's not easy to undo if you go to big .
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: JohnRR]
#308629
05/06/09 05:21 PM
05/06/09 05:21 PM
|
Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
|
John, the pistons will take whatever the engine can, right up until it pings. With all the variables involved in mass production pistons and a thousand things that could go wrong that are not KB's fault, I think it's one of those "Publish it so we have an out" when something does go wrong that is not thier problem. They can take a little detonation and ping, but on a fresh build... I cringe at audible ping.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: 6pakdude]
#308630
05/06/09 07:11 PM
05/06/09 07:11 PM
|
Joined: Feb 2005
Posts: 4,316
Prospect, PA
BSB67
master
|
master
Joined: Feb 2005
Posts: 4,316
Prospect, PA
|
Quote:
Cold engine 170psi.
Is this to muck for my voodoo cam?
No. But everything needs to be right.
|
|
|
Re: "Detonation problems" rebuild 440-6
[Re: 6pakdude]
#308634
05/07/09 01:46 AM
05/07/09 01:46 AM
|
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
|
Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
|
Quote:
Anyone have a recommendation what size jet in front and rear carb to use for my engine.using the Promax plates
Those metering plates I use right now, does anybodt know what size they are. Same for the stock plates.
Secondary metering plates are identified by the number stamped into them... This chart gives you main jet sizes plus idle jet size & the full holley part numbers...
http://www.junkyardgenius.com/holley/2ndplates.html
|
|
|
|
|
