Which is prefered and what seat widths on honda engines?

what size seat widths are preferred in all motor set up's vs turbo?

 

sorry to double post but I've noticed alot in the domestic industry that alot of aftermarket head companies like airflow research are using radius seats on intakes and are claiming huge gains over a standard 5 angle.

Does this hurt the shearing affect and harm fuel atomization or are the gains in airflow enough to outweigh the negatives.

sorry if this doesn't make too much sense been a very long (16hr) work day.

I just want to see some discussions on the topic and feel this is the best place for it.

 

who cares

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMLoser &raquo;</TD></TR><TR><TD CLASS="quote">who cares </TD></TR></TABLE>

go away.

In for a detailed answer

 

Way to bring back a nearly archived thread from 3 months ago that noone replied to just to be a feminine odor management product.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMLoser &raquo;</TD></TR><TR><TD CLASS="quote">who cares </TD></TR></TABLE>

The people that care are the ones that you pay big money to in order to make your car fast because you don't have the tools or know how to figure it out.

 

In my opinion, a radius intake seat is only useful on race vehicles that see only high flow velocity. The angles on standard cuts help 'direct' the air into the cylinder under low lift low velocity conditions.

 

basically you can't have your cake and eat it too....

either have a crazy flowing head for peak power production or have something that will run a bit better on the street

 

in a street car, i've never seen the point of more than a three-angle valve grind. five is just overkill.

 

Does anyone have the dimensions of the factory ITR or standard bseries vale job from a factory service manual?

 

For a street car--the way I understand it a 5 angle or a radius isn't going to last very long--since each "angle" where the valve contacts the seat is so small it seems like it would pounded out or flattened with the quickness. I have no PERSONAL experience with this--this is just what I hear so take it for what its worth.....Add to that, who is to say a 5 angle or a radius will even make more power for your application?

 

There is only one seat on a valve job. Depending on valve and seat material, seat width, spring pressure, rpm, kind of fuel being used, state of tune, coatings and combustion/exhaust temperatures a multiangle valve job may lose or retain its shape after 10 passes down the strip or 300,000 miles.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d16dcoe45 &raquo;</TD></TR><TR><TD CLASS="quote">Add to that, who is to say a 5 angle or a radius will even make more power for your application?</TD></TR></TABLE>

The guy with a flowbench to back up his work with comparative dynographs.

All I know is that when I pulled a brand new set of the supposed best (highest flowing) 23 degree SMALL block chevy heads apart for my buddy's 454 to swap out valve springs it had radius seats on the intake and the exhaust. Apparently Air Flow Research decided ultimate flow is more important than mixture quality.... even on carb'd engines.