Cam and valvetrain longevity....??? low duration high lift...
10-01-2016 | 08:42 PM
#911
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Gold Member
Joined: Oct 2005
Posts: 11,688
Likes: 216
From: Olmsted Falls,Ohio Marblehead,Oh
I hear ya on the carb thing, learning more since 2014 also.. I am much smarter now and educated and continue to learn, you know I will do what I can to
Maximize this time, without re inventing wheel ...I trust my buddy's ability to come up with cam specs per cylinder head flow and will address all that when that time comes...hoping to Dyno in Jan or so... With you and Ryan, if that happens I am gonna schedule a 3-4 day trip to really play with things more, last time was a "let's see what you have session" as you know lets see how it goes this time!!!
Maximize this time, without re inventing wheel ...I trust my buddy's ability to come up with cam specs per cylinder head flow and will address all that when that time comes...hoping to Dyno in Jan or so... With you and Ryan, if that happens I am gonna schedule a 3-4 day trip to really play with things more, last time was a "let's see what you have session" as you know lets see how it goes this time!!!
You might go from 73.2, to 73.3! 
I pretty much suggested a dominator from the get go on this build. That thread was a whole nother chit show of arguing. You said no way, because you couldn't fit it. Now, you're willing to find room, to fit a spacer under your current carb, and worried your carb is too small?! lol
I think this time around, you might be best to do your own engine development. What I mean is, taking advice from 30 different avenues, is not necessarily a bad thing, but at the end of the day, strapping the thing on a dyno, and trying out various carbs, various intakes, swapping exhaust, etc. Sometimes, what looks great on paper, doesn't always work.
You know Ryan Retter is flexible with you, and will work with you to try different things on the dyno, and won't nickel and dime you for the time. Theres no point in cutting up your hatch, if its a 10hp gain. Now, if you find a particular intake/carb combo, that nets you 25, 35, 40+hp , you may want to modify the hatch. Same thing with exhaust. You might find 10hp from switching from your manifolds to a header setup, or you might find 50hp. That might sway you to looking into different exhaust, or keeping what you have. But, you gotta do the testing. What works on one guys engine, might not work on yours. BCK spent some time on fine tuning his intake/carb combo. He found what , like 25hp doing so? Thats not a bad gain at all.
We have enough of us here, that I am sure someone would be willing to loan out an intake, a carb, maybe even some spacers, etc, to try .
I pretty much suggested a dominator from the get go on this build. That thread was a whole nother chit show of arguing. You said no way, because you couldn't fit it. Now, you're willing to find room, to fit a spacer under your current carb, and worried your carb is too small?! lol
I think this time around, you might be best to do your own engine development. What I mean is, taking advice from 30 different avenues, is not necessarily a bad thing, but at the end of the day, strapping the thing on a dyno, and trying out various carbs, various intakes, swapping exhaust, etc. Sometimes, what looks great on paper, doesn't always work.
You know Ryan Retter is flexible with you, and will work with you to try different things on the dyno, and won't nickel and dime you for the time. Theres no point in cutting up your hatch, if its a 10hp gain. Now, if you find a particular intake/carb combo, that nets you 25, 35, 40+hp , you may want to modify the hatch. Same thing with exhaust. You might find 10hp from switching from your manifolds to a header setup, or you might find 50hp. That might sway you to looking into different exhaust, or keeping what you have. But, you gotta do the testing. What works on one guys engine, might not work on yours. BCK spent some time on fine tuning his intake/carb combo. He found what , like 25hp doing so? Thats not a bad gain at all.
We have enough of us here, that I am sure someone would be willing to loan out an intake, a carb, maybe even some spacers, etc, to try .
10-01-2016 | 08:45 PM
#912
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Joined: Nov 2004
Posts: 14,094
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From: On A Dirt Floor
p92 !
10-01-2016 | 09:17 PM
#913
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Joined: Feb 2009
Posts: 8,356
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From: NW Michigan
That cam is too small. Need mid 250's on intake high 250's exhaust 109 lsa cam needs to go in 10 degrees advanced. Something along those line in mid 5xx" motors with 320range heads will be in the 725-750hp range a tic over 6,000 rpm's with compression in 9.5:1 range. They really make a bunch more torque if you put a dome piston in them around 10.3:1
This type of cam will revert h2o
This type of cam will revert h2o
Interesting stuff.
10-01-2016 | 10:26 PM
#915
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Joined: Mar 2008
Posts: 1,181
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From: Vancouver BC
So assuming cam has no advance ground into based on the duration numbers you mentioned to install at 10 deg advanced. I see where larger CI engines absorbs duration say for instance from a 454 to a 540 or larger. So with that said would it also be correct to say comparing to 572 builds with different stroke combos the longer stroke build would have lower peak hp rpm than that of the shorter stroke. But back to your original comment I'd guess with the duration you mentioned based on a 540 you'd be looking at approximately 7k peak rpm + or -? If advancing 1 deg = 100 rpm to bring it in around 6k.
Interesting stuff.
Interesting stuff.
10-01-2016 | 10:31 PM
#917
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Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
So assuming cam has no advance ground into based on the duration numbers you mentioned to install at 10 deg advanced. I see where larger CI engines absorbs duration say for instance from a 454 to a 540 or larger. So with that said would it also be correct to say comparing to 572 builds with different stroke combos the longer stroke build would have lower peak hp rpm than that of the shorter stroke. But back to your original comment I'd guess with the duration you mentioned based on a 540 you'd be looking at approximately 7k peak rpm + or -? If advancing 1 deg = 100 rpm to bring it in around 6k.
Interesting stuff.
Interesting stuff.
10-01-2016 | 10:57 PM
#918
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
Black Baja, what ever happened to the Grumpy heads I sold you a few years ago?
How come we haven't seen each other on the water yet? Or maybe we have and I didn't out 2&2 together? Where do you usually run too?
How come we haven't seen each other on the water yet? Or maybe we have and I didn't out 2&2 together? Where do you usually run too?
10-01-2016 | 11:17 PM
#919
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Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
We keept our Fountain in Middle river on a lift. We were out every weekend. Pretty much rafted up at Still Pond every Saturday and Sunday. Gave the heads to a friend of mine who never used them. I have two more sets of those same heads if you know anyone that needs heads.
10-02-2016 | 12:47 AM
#920
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From: Grand Rapids, MI
