0.015" SBC gaskets are < $10 ea. from some sources...Carnut1 wrote: ↑Mon Nov 19, 2018 6:12 pm Very happy, Now if we could just get some thin head gaskets donated to fix that miserable quench I would be thrilled! I know, I am a pain. I will add that the larger cam and fixed quench with some timing runs will cut deep into that stock block's max strength limits. Thanks, Charlie
2 heads better than 1 - power porting E7TE iron.
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Re: 2 heads better than 1 - power porting E7TE iron.
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
Re: 2 heads better than 1 - power porting E7TE iron.
I’m not sure how your going to make those work on an SBFMadBill wrote: ↑Mon Nov 19, 2018 9:21 pm0.015" SBC gaskets are < $10 ea. from some sources...Carnut1 wrote: ↑Mon Nov 19, 2018 6:12 pm Very happy, Now if we could just get some thin head gaskets donated to fix that miserable quench I would be thrilled! I know, I am a pain. I will add that the larger cam and fixed quench with some timing runs will cut deep into that stock block's max strength limits. Thanks, Charlie
Re: 2 heads better than 1 - power porting E7TE iron.
My finger's on autopilot...
Fewer bolt holes, fewer choices, more $$...it ain't easy being Ford.
The thinnest I could find in a quick search is 0.027".
Fewer bolt holes, fewer choices, more $$...it ain't easy being Ford.
The thinnest I could find in a quick search is 0.027".
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
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Re: 2 heads better than 1 - power porting E7TE iron.
Jesus - don't let Mike know but that lobe i quoted might have been the CC one on my desk not Mikes - --- ehhh - 76 next B/day!!!
DV
David Vizard Small Group Performance Seminars - held about every 2 months. My shop or yours. Contact for seminar deails - davidvizardseminar@gmail.com for details.
Re: 2 heads better than 1 - power porting E7TE iron.
Don’t feel bad...I’ve been having plenty of “senior” moments lately. I’ll be 47 in a few weeksDavid Vizard wrote: ↑Mon Nov 19, 2018 10:10 pmJesus - don't let Mike know but that lobe i quoted might have been the CC one on my desk not Mikes - --- ehhh - 76 next B/day!!!
DV
I was just curious is all. I’ve got one of Mikes 264/268, 218/222, .544/.544 hydraulic rollers here for a 351w I’m putting together for one of my trucks. I think it will do ok
Re: 2 heads better than 1 - power porting E7TE iron.
I was just giving you a hard time lol
Cometic is about your only choice for thin sbf head gaskets...and they certainly don’t give them away
Re: 2 heads better than 1 - power porting E7TE iron.
It will be a 268/222, .544" on 110
Mike Jones
Jones Cam Designs
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Jones Cam Designs
Denver, NC
jonescams@bellsouth.net
http://www.jonescams.com
Jones Cam Designs' HotPass Vendors Forum: viewforum.php?f=44
(704)489-2449
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Re: 2 heads better than 1 - power porting E7TE iron.
Thanks for the correction Mikey.
DV
David Vizard Small Group Performance Seminars - held about every 2 months. My shop or yours. Contact for seminar deails - davidvizardseminar@gmail.com for details.
Re: 2 heads better than 1 - power porting E7TE iron.
Will that be a hft or hyd roller? Thanks, Charlie
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Re: 2 heads better than 1 - power porting E7TE iron.
Hyd. roller.
Just had a call from Mike - good news - cam will be shipping today.
DV
David Vizard Small Group Performance Seminars - held about every 2 months. My shop or yours. Contact for seminar deails - davidvizardseminar@gmail.com for details.
Re: 2 heads better than 1 - power porting E7TE iron.
Nice! I guess 390hp with DV/Charlie E7's with fixed quench and 32 degrees timing. Thanks, Charlie
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Re: 2 heads better than 1 - power porting E7TE iron.
Continuing my last post from page 36 which dealt with the discharge coefficients and how the curves can give a good insight ito where you need to make you next mods lets move on to the subject of port velocity. This is something that is almost universally accepted as important but very few head porters seem to have any idea what the numbers should be or, if they do, to pass them on.
Well here is some data that will fix that situation.
Take a look at the IOP graph shown below. Here are the mean velocity figures for RBJ Racing's head versus the stock head.
The thin lines are the stock head and the thick lines the RBJ head. Blue is intake and red ex.. What is the target velocity we should shoot for?
The way the IOP program deals with this we should be targeting about 290 - 330 in the intake and 300 to 350 on the exhaust. So lets see where we are.
First the intake.
As can be seen the velocity went up by a goodly amount. At the top of the lift range used by our baby 260 degree cam the mean port velocity on John's heads were up by over 26%. So the intake ports had a lot more flow and at any given lift, and more velocity. That accounts for the excellent torque output and the good top end power achieved without have to turn excessive RP{M.
As for the exhaust we can see the flow was gained at the expense of velocity.This indicates the port is too big and a more efficient but smaller CSA port needs to be sought after. That reduction on velocity means the scavenging effect is reduced and that can have a measurable effect on torque throughout the rpm range but more so at the low rpm used in street driving.
The increase in torque due to better scavenging at O/L and ramming at the end of the induction stroke is due to the increased velocity and air mass involved. In other words the kinetic energy it contains that, when slowed by a resistance can be turned into a higher pressure energy to better fill the cylinders.
and now we have broached the seemingly touchy subject of port energy I will show what the difference is between a stock head and RBJ Johns modified head. I will also answer the question of whether the increased exhaust flow was of grater benefit the the loss of velocity a detriment. Watch out for the flack and my next post.
DV
Well here is some data that will fix that situation.
Take a look at the IOP graph shown below. Here are the mean velocity figures for RBJ Racing's head versus the stock head.
The thin lines are the stock head and the thick lines the RBJ head. Blue is intake and red ex.. What is the target velocity we should shoot for?
The way the IOP program deals with this we should be targeting about 290 - 330 in the intake and 300 to 350 on the exhaust. So lets see where we are.
First the intake.
As can be seen the velocity went up by a goodly amount. At the top of the lift range used by our baby 260 degree cam the mean port velocity on John's heads were up by over 26%. So the intake ports had a lot more flow and at any given lift, and more velocity. That accounts for the excellent torque output and the good top end power achieved without have to turn excessive RP{M.
As for the exhaust we can see the flow was gained at the expense of velocity.This indicates the port is too big and a more efficient but smaller CSA port needs to be sought after. That reduction on velocity means the scavenging effect is reduced and that can have a measurable effect on torque throughout the rpm range but more so at the low rpm used in street driving.
The increase in torque due to better scavenging at O/L and ramming at the end of the induction stroke is due to the increased velocity and air mass involved. In other words the kinetic energy it contains that, when slowed by a resistance can be turned into a higher pressure energy to better fill the cylinders.
and now we have broached the seemingly touchy subject of port energy I will show what the difference is between a stock head and RBJ Johns modified head. I will also answer the question of whether the increased exhaust flow was of grater benefit the the loss of velocity a detriment. Watch out for the flack and my next post.
DV
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David Vizard Small Group Performance Seminars - held about every 2 months. My shop or yours. Contact for seminar deails - davidvizardseminar@gmail.com for details.
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Re: 2 heads better than 1 - power porting E7TE iron.
Well I'll get the Popcorn and kick back! This is very good info... Keep it coming
Re: 2 heads better than 1 - power porting E7TE iron.
Guess it depends on where you currently stand on the engines you build.RTercovich wrote: ↑Sun Nov 11, 2018 10:12 pm One problem with software programs is that the program is only as smart as the person that designed it or the intelligence in which he/she chose to incorporate with the program. The flow bench falls into a "similar" category to a certain extent because tests are steady state and we all know that's a completely different story in a live engine. Programs and benches are great "basic" tools for "general guidelines" but if you are searching for more, you must dig deeper and twist your brain in a knot to find your finish line.
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Re: 2 heads better than 1 - power porting E7TE iron.
Which of the heads had the biggest port energy?