Bench Data
Moderator: Team
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
Bench Data
Working on a set of 195cc Pro-Filers for my IROC build. I was going to do the port much like a Super Stock head. The head flows lots of air, and not sure it what I want to do. However, some interesting data to share.
Both ports have the same valve job, same SSR height and shape, same LS 8mm valves.
One port is oval and raised. Notice the flow curve difference. The raised port is 30 fps on the floor vs the standard height port.
Both ports have the same valve job, same SSR height and shape, same LS 8mm valves.
One port is oval and raised. Notice the flow curve difference. The raised port is 30 fps on the floor vs the standard height port.
Re: Bench Data
Chad do you think the approach leading to the SSR is more responsible for the difference
Or do you think it's the Oval shape. I guess I'm curious what you think the difference would be (if any) if you raised the runner and kept the roof shape squared or out of the box shape so to speak.
Or do you think it's the Oval shape. I guess I'm curious what you think the difference would be (if any) if you raised the runner and kept the roof shape squared or out of the box shape so to speak.
Re: Bench Data
Chad, have you ever done any port development with the opposite shape?? As in, have you ever raised and made the roof of the port square, while leaving the floor round? Just curious as to what you think.
-
- Vendor
- Posts: 11003
- Joined: Mon Apr 11, 2005 2:30 am
- Location: CA
Re: Bench Data
Could you add a little detail to this line?The raised port is 30 fps on the floor vs the standard height port.
I don't get what you are saying.
Which line is the raised port?
Where is it measured?
Helping to Deliver the Promise of Flying Cars
-
- Guru
- Posts: 1576
- Joined: Mon Apr 04, 2011 8:54 pm
- Location: central Florida
- nhrastocker
- Expert
- Posts: 798
- Joined: Mon Jan 14, 2008 12:21 pm
- Location: Arizona
Re: Bench Data
Chad,
Many of the fast Chevy Super Stock cylinder heads have been ported and epoxied into an oval intake port.
The first Heads-Up, Dave Layer, cylinder heads I took a look at in the early 1980's, had oval port heads and the car was a record holder in its class.
Many of the fast Chevy Super Stock cylinder heads have been ported and epoxied into an oval intake port.
The first Heads-Up, Dave Layer, cylinder heads I took a look at in the early 1980's, had oval port heads and the car was a record holder in its class.
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
Re: Bench Data
The raised line is the oval port. The floor speed with the oval and raised port is 30 fps faster with the pitot on the floor straight across.SchmidtMotorWorks wrote: ↑Sat Aug 31, 2019 8:48 pmCould you add a little detail to this line?The raised port is 30 fps on the floor vs the standard height port.
I don't get what you are saying.
Which line is the raised port?
Where is it measured?
It's well over 400 fps.
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
Re: Bench Data
Every Super Stock head that I do is oval and raised. That is why I wanted to try it on this.nhrastocker wrote: ↑Sat Aug 31, 2019 10:55 pm Chad,
Many of the fast Chevy Super Stock cylinder heads have been ported and epoxied into an oval intake port.
The first Heads-Up, Dave Layer, cylinder heads I took a look at in the early 1980's, had oval port heads and the car was a record holder in its class.
However these flow way too much air to be this small and oval, IMO.
Re: Bench Data
So what's the fix; aside from less duration and lift, which can't be a terrible thing for a street engine?SpeierRacingHeads wrote: ↑Sun Sep 01, 2019 1:14 pmEvery Super Stock head that I do is oval and raised. That is why I wanted to try it on this.nhrastocker wrote: ↑Sat Aug 31, 2019 10:55 pm Chad,
Many of the fast Chevy Super Stock cylinder heads have been ported and epoxied into an oval intake port.
The first Heads-Up, Dave Layer, cylinder heads I took a look at in the early 1980's, had oval port heads and the car was a record holder in its class.
However these flow way too much air to be this small and oval, IMO.
Re: Bench Data
They look great and I expect they will make a serious street sweeper. The fast floor doesn't bother me if it has a low speed gradient across the floor and has a smooth sound at higher depressions. Please share some cfm and shortblock specs. Thanks, Charlie
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST
631-816-4911
9:00am - 9:00pm EST
Re: Bench Data
[/quote]
However these flow way too much air to be this small and oval, IMO.
[/quote]
What do you mean? How is this a bad thing? Or am I not picking up on sarcasm?
However these flow way too much air to be this small and oval, IMO.
[/quote]
What do you mean? How is this a bad thing? Or am I not picking up on sarcasm?
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
Re: Bench Data
Head doesn't have enough cross section. Need to slow it downRevTheory wrote: ↑Sun Sep 01, 2019 1:24 pmSo what's the fix; aside from less duration and lift, which can't be a terrible thing for a street engine?SpeierRacingHeads wrote: ↑Sun Sep 01, 2019 1:14 pmEvery Super Stock head that I do is oval and raised. That is why I wanted to try it on this.nhrastocker wrote: ↑Sat Aug 31, 2019 10:55 pm Chad,
Many of the fast Chevy Super Stock cylinder heads have been ported and epoxied into an oval intake port.
The first Heads-Up, Dave Layer, cylinder heads I took a look at in the early 1980's, had oval port heads and the car was a record holder in its class.
However these flow way too much air to be this small and oval, IMO.
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
Re: Bench Data
However these flow way too much air to be this small and oval, IMO.
[/quote]
What do you mean? How is this a bad thing? Or am I not picking up on sarcasm?
[/quote]
Too fast IMO.
-
- Vendor
- Posts: 945
- Joined: Sun May 13, 2012 1:28 pm
- Location: KS
- Contact:
Re: Bench Data
Port is about 188cc. 2.08 LS valve. Flows 300@.500 and 305@.600, and 308@.700
4.165 x 3.48
Scat 9000 crank and rods
Weisco Pro Tru pistons
TPiS 231/236 roller cam
.580 lift
Morel lifters
NHRA legal stocker pan