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Re: [Fot] I cut intake & exhaust port sections today ( tr4 )

To: "'John Styduhar'" <johnstydo@gmail.com>
Subject: Re: [Fot] I cut intake & exhaust port sections today ( tr4 )
From: "Jim Gray" <toodamnfunky@comcast.net>
Date: Sat, 20 Oct 2012 08:36:42 -0600
Cc: fot@autox.team.net
Delivered-to: fot-archive@autox.team.net
Delivered-to: fot@autox.team.net
Thread-index: Ac2uvpT5mpi2sIlqQWWwUBEqEuX2gwADJAKw
I'm definitely going to be looking at valve seats. They play a really big
roll in the overall flow.

As far as valve guides go we will do some testing with and without. More
importantly though

I want to try a fuel shear ramp before and after the valve / guides to
smooth turbulence.

I want to get maximum velocity first.

jim

 

 

  _____  

From: John Styduhar [mailto:johnstydo@gmail.com] 
Sent: Saturday, October 20, 2012 6:30 AM
To: Jim Gray
Subject: Re: [Fot] I cut intake & exhaust port sections today ( tr4 )

 

Great work Jim.  Do you have any plans to test modifications other than port
design, like valve seat profile and whether or not grinding of the exposed
valve guides has any effect on flow?  

On Sat, Oct 20, 2012 at 2:04 AM, Jim Gray <toodamnfunky@comcast.net> wrote:

The exhaust doesn't have to be as efficient as the intake because the charge
is under pressure on the way out but that square 90 degree turn could
benefit from a fillet weld right in the corner behind the valve guide boss.
The intake isn't bad really except it's a pretty tight curve coming off the
valve seat. That curve will get flattened out.
I'll be doing some silicone casts of the stock ports and then I'll make some
of my current ported head. We'll start in on the flowbench next month.

jg



-----Original Message-----
From: Bill Babcock [mailto:ponobill@gmail.com]
Sent: Friday, October 19, 2012 10:18 PM
To: Jim Gray
Cc: fot@autox.team.net
Subject: Re: [Fot] I cut intake & exhaust port sections today ( tr4 )

Yeah, the exhaust port looks like it was cast using plumbing parts. Intake
is not that much better.
On Oct 19, 2012, at 8:23 PM, "Jim Gray" <toodamnfunky@comcast.net> wrote:

> FoT,
> I cut some TR4 port sections today, right down the middle of the valve
> guides. It sure is a different view of the
>
> TR4 ports. The exhaust port is a mess. I'm going to try welding around the
> back of the valve guide boss
>
> and try to smooth out that wall the exhaust charge slams into just outside
> the valve seat.
>
> We'll find out on the flow bench, I have three more cylinders to
experiment
> with
>
>
>
> Pix are on photobucket
>
> http://s698.photobucket.com/albums/vv341/TR4jim/Cylinder%20head/
>
>
>
> jim g
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