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Originally Posted by Black Baja
(Post 4233858)
I was thinking more along the lines of trying to help a poor cylinder head out that's going to have a hard time keeping the fuel suspended in air as it travels through the port and in return keeping it out of detontion. Right or wrong? Like I said not the expert. Please enlighten me on this theory.
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Originally Posted by HaxbySpeed
(Post 4233870)
The best way to make use of a cylinder head that is larger then optimal, is to increase the rpm of the engine. To increase the rpm, you're going to need more duration, more duration will move the whole power curve up, a wider lobe sep will flatten the torque curve and make a broader power band. This can help in an application like this, and make it easier to prop the boat for all around performance. Also, the bigger duration cam will effect the idle, a wider lobe sep will help here too.
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Originally Posted by HaxbySpeed
(Post 4233852)
Everyone benefits when good technical discussions take place. I'm laying in bed with a fever, so I need a distraction. Lol
Both sets of these lobes, either when widened or put closer together, will increase pressure. Guaranteed. http://3.bp.blogspot.com/-WgozSmW2jO...nizales++6.jpg |
454 semi closed chambered oval port 10.3-1 compr,vic jr oval intake.cam 230,236 ls110,flat tappet no less,made 527hp,517tq at 2 places,4100 and 5100rpm's.water dunoed at the end of the tails.carbs were 930 or 950cfm bolands,laws or something like that.anyone that rode in my boat could not believe how had the acceration was.any time from 30mph on up .
other thing they loved was blipping the throttle on the stand,,instant rev up,very,very responsive. I loved those engines,,simple and fast. |
Originally Posted by Black Baja
(Post 4233883)
Alex, if the lobe separation gives you a broader torque curve then why on engines that run in a small rpm window are they using 118-121 Lsa cams? Is it to move the torque curve way up in the motor? I don't know. Always wondered why.
Let me take a stab - super effecient cylinder heads,chambers and domes, very high compression, and a ton of rpm. |
oh and my tq curve was almost flat.
both engines after they were done in my boat were sold off to hot rod guys,,and they loved them. |
Originally Posted by Black Baja
(Post 4233883)
Alex, if the lobe separation gives you a broader torque curve then why on engines that run in a small rpm window are they using 118-121 Lsa cams? Is it to move the torque curve way up in the motor? I don't know. Always wondered why.
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Originally Posted by sutphen 30
(Post 4233889)
454 semi closed chambered oval port 10.3-1 compr,vic jr oval intake.cam 230,236 ls110,flat tappet no less,made 527hp,517tq at 2 places,4100 and 5100rpm's.water dunoed at the end of the tails.carbs were 930 or 950cfm bolands,laws or something like that.anyone that rode in my boat could not believe how had the acceration was.any time from 30mph on up .
other thing they loved was blipping the throttle on the stand,,instant rev up,very,very responsive. I loved those engines,,simple and fast. |
Originally Posted by SB
(Post 4233890)
Are you talking Pro Stock here ?
Let me take a stab - super effecient cylinder heads,chambers and domes, very high compression, and a ton of rpm. |
Originally Posted by SB
(Post 4233890)
Are you talking Pro Stock here ?
Let me take a stab - super effecient cylinder heads,chambers and domes, very high compression, and a ton of rpm. |
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