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Hey guys, I have a BB engine question? #964429 04/02/11 03:29 PM 04/02/11 03:29 PM
Joined: Jun 2008 Posts: 577 Arkansas A Adrielp OP mopar
Adrielp OP mopar A Joined: Jun 2008 Posts: 577 Arkansas	Is there a formula available to determine how big a valve a particular bore can support? Like for instance, could a 4.375 bore handle a 2.4in diameter valve if the head could supply enough air flow. I know some of you engine gurus can point me in the right direction. This engine of course would be a very wild high end comp style engine turning +9000rpm. I'm thinking it would take that type of rpm to move the air. Thanks for the help, its much appreciated! -Adriel Adriel Paradise Substation Design Engineer III

Re: Hey guys, I have a BB engine question? [Re: Adrielp] #964430 04/02/11 03:47 PM 04/02/11 03:47 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	i have seen a topic on this on speedtalk.com if you want to do a search there on it. http://speedtalk.com/forum/viewtopic.php...87b39aef0d16e19 Last edited by METAL STORM; 04/02/11 03:51 PM.

Re: Hey guys, I have a BB engine question? [Re: blownzoom440] #964431 04/02/11 04:07 PM 04/02/11 04:07 PM
Joined: Apr 2005 Posts: 1,106 Quebec, Canada D Diablo super stock
Diablo super stock D Joined: Apr 2005 Posts: 1,106 Quebec, Canada	My worry is what head are you going to try and use? I'm pretty sure the wedge heads that can fit a 2.4 valve all need a min of a 4.5 bore. Although I could be wrong.

Re: Hey guys, I have a BB engine question? [Re: Diablo] #964432 04/02/11 04:23 PM 04/02/11 04:23 PM
Joined: Jul 2008 Posts: 30,447 Florida STAYcation dOoC The village idiot's idiot
dOoC The village idiot's idiot Joined: Jul 2008 Posts: 30,447 Florida STAYcation	BIG rpm .... gotsta' have have big valves OR many of them. On the opposite end ...I am building a loooow rpm engine with smaller ports and smaaaall valves ... 1.88 and 1.50. But it will never see much-over 4500 or so.

Re: Hey guys, I have a BB engine question? [Re: Diablo] #964433 04/02/11 04:27 PM 04/02/11 04:27 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: My worry is what head are you going to try and use? I'm pretty sure the wedge heads that can fit a 2.4 valve all need a min of a 4.5 bore. Although I could be wrong. I was going to run my B1m/c with a 2.4 valve on a 4.440 bore... but I didnt like the shrouding ... this was going to be a 9000+ rpm engine(514ci)

Re: Hey guys, I have a BB engine question? [Re: blownzoom440] #964434 04/02/11 04:40 PM 04/02/11 04:40 PM
Joined: Jun 2008 Posts: 577 Arkansas A Adrielp OP mopar
Adrielp OP mopar A Joined: Jun 2008 Posts: 577 Arkansas	Quote: i have seen a topic on this on speedtalk.com if you want to do a search there on it. http://speedtalk.com/forum/viewtopic.php...87b39aef0d16e19 Thanks very much! That was a big help. Looks like 2.34in is the magic number. Adriel Paradise Substation Design Engineer III

Re: Hey guys, I have a BB engine question? [Re: MR_P_BODY] #964435 04/02/11 05:35 PM 04/02/11 05:35 PM
Joined: Jun 2008 Posts: 577 Arkansas A Adrielp OP mopar
Adrielp OP mopar A Joined: Jun 2008 Posts: 577 Arkansas	Quote: Quote: My worry is what head are you going to try and use? I'm pretty sure the wedge heads that can fit a 2.4 valve all need a min of a 4.5 bore. Although I could be wrong. I was going to run my B1m/c with a 2.4 valve on a 4.440 bore... but I didnt like the shrouding ... this was going to be a 9000+ rpm engine(514ci) Morgan says use a valve that is 52-.525 of the bore for all wedge heads and .53-.535 of the bore for canted valve heads so that would be a 2.33in valve for that B1 combo. This question was more of theoretical thing for my purposes. And lets just say I'm tinkering around with cylinder head design. Thanks for all the help, I pretty much found what I needed and more. These forums are great for the brain sometimes as I'm constantly learning more and more. Thanks again You guys also gave me another question to ask. I will put this one in the boosted forum though. Adriel Paradise Substation Design Engineer III

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