PISTONS AND COMP RATIO
#1
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Join Date: Dec 2002
Location: spring creek nv.
Posts: 329
PISTONS AND COMP RATIO
I BOUGHT A NEW SET OF DIAMOND FLAT TOP PISTONS FOR MY 540BBC BLOWER ENGINE I'M BUILDING.AFTER BUYING I DECIDED TO GO ALKY ON ENGINE.NOW I'M BEING TOLD I SHOULD HAVE AT LEAST A 11-1 COMP...PISTON INFORMATION IS 4;50 BORE--COMP HEIGHT IS 1.520--EFFECTIVE VOLUME= -3.0CC
I HAVE A TALL DECK[NEW DART BLOCK.NO MACHINE WORK DONE YET ON IT.]..4.25 STROKE CRANK..6.353 RODS..BRODIX HEADS WITH 119CC CAMBERS RIGHT NOW[I'M GOING TO HAVE CBOGGS DO THE PORTING AND FLOWING ON THEM]
MY QUEST IS CAN I GET THE COMP I NEED WITH THESE PISTONS AND IF SO HOW DO I GO ABOUT IT?
OR SHOULD I SELL AND BUY DIFFERENT PISTONS?
I HAVE A TALL DECK[NEW DART BLOCK.NO MACHINE WORK DONE YET ON IT.]..4.25 STROKE CRANK..6.353 RODS..BRODIX HEADS WITH 119CC CAMBERS RIGHT NOW[I'M GOING TO HAVE CBOGGS DO THE PORTING AND FLOWING ON THEM]
MY QUEST IS CAN I GET THE COMP I NEED WITH THESE PISTONS AND IF SO HOW DO I GO ABOUT IT?
OR SHOULD I SELL AND BUY DIFFERENT PISTONS?
#4
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Join Date: Jan 2006
Location: La.
Posts: 2,890
Re: PISTONS AND COMP RATIO
Originally Posted by hotrodharley
I BOUGHT A NEW SET OF DIAMOND FLAT TOP PISTONS FOR MY 540BBC BLOWER ENGINE I'M BUILDING.AFTER BUYING I DECIDED TO GO ALKY ON ENGINE.NOW I'M BEING TOLD I SHOULD HAVE AT LEAST A 11-1 COMP...PISTON INFORMATION IS 4;50 BORE--COMP HEIGHT IS 1.520--EFFECTIVE VOLUME= -3.0CC
I HAVE A TALL DECK[NEW DART BLOCK.NO MACHINE WORK DONE YET ON IT.]..4.25 STROKE CRANK..6.353 RODS..BRODIX HEADS WITH 119CC CAMBERS RIGHT NOW[I'M GOING TO HAVE CBOGGS DO THE PORTING AND FLOWING ON THEM]
MY QUEST IS CAN I GET THE COMP I NEED WITH THESE PISTONS AND IF SO HOW DO I GO ABOUT IT?
OR SHOULD I SELL AND BUY DIFFERENT PISTONS?
I HAVE A TALL DECK[NEW DART BLOCK.NO MACHINE WORK DONE YET ON IT.]..4.25 STROKE CRANK..6.353 RODS..BRODIX HEADS WITH 119CC CAMBERS RIGHT NOW[I'M GOING TO HAVE CBOGGS DO THE PORTING AND FLOWING ON THEM]
MY QUEST IS CAN I GET THE COMP I NEED WITH THESE PISTONS AND IF SO HOW DO I GO ABOUT IT?
OR SHOULD I SELL AND BUY DIFFERENT PISTONS?
Alcohol likes lot's of compression to preform at it's best, but be sure to get blower pistons/dropped ring land.
JMO
Zip.
#5
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Join Date: Feb 2006
Location: VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
Posts: 540
If your intake fits now, it will fit after Curtis does the angle milling on them. He will cut mostly one side of the head to reduce chamber cc and will alter the bolt holes and the under head spot facing of the bolt heads plus correcting the intake port angles.
Your valve to piston clearance will become less and the valve angle of the valve relief in the piston will not need to be so steep.
Talk it over with him.
Ed
Your valve to piston clearance will become less and the valve angle of the valve relief in the piston will not need to be so steep.
Talk it over with him.
Ed
#7
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Join Date: Jan 2006
Location: La.
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Originally Posted by edvancedengines
O'boy,
If zip is right angle milling won't do it.
O'well
Ed
If zip is right angle milling won't do it.
O'well
Ed
http://www.wallaceracing.com/cr_test2.php
Zip.
#9
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Join Date: Feb 2006
Location: VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
Posts: 540
Those 6.535 rods are a little short but can be made to work in this. I can do you up a pistong that might give you something extra in performance and in durability when you get to that point if you are interested.
I would still get Curtis to angle mill your heads though. There are nothing but positives with this. No matter whose piston you use it will need less dome and also less valve angle too.
Ed
I would still get Curtis to angle mill your heads though. There are nothing but positives with this. No matter whose piston you use it will need less dome and also less valve angle too.
Ed
#10
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RACING JUNKIE
Join Date: Jan 2006
Location: La.
Posts: 2,890
I'm with ED on this, there's nothing that increases the flow better than angle milling the heads.
Work with ED and Curtis on this build and i'm certain you'll have the baddest 540 on the planet. I have total respect for both of these builders and they know what they are doing.
In fact i'm going to talk serious to Curtis about doing my heads for my 383 blown motor, it's already been 4.62 @ 2600lbs when it was a 358" motor. Next i'm going to talk to my Doctor to see if i have the B?lls to drive it in an 1800lb Anglia.
Good luck and i think you made a wise choice to get new pistons. I can only hope that i helped in this decision with the formulia that i posted.
Zip.
Work with ED and Curtis on this build and i'm certain you'll have the baddest 540 on the planet. I have total respect for both of these builders and they know what they are doing.
In fact i'm going to talk serious to Curtis about doing my heads for my 383 blown motor, it's already been 4.62 @ 2600lbs when it was a 358" motor. Next i'm going to talk to my Doctor to see if i have the B?lls to drive it in an 1800lb Anglia.
Good luck and i think you made a wise choice to get new pistons. I can only hope that i helped in this decision with the formulia that i posted.
Zip.