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splitpile Samba's Worst Speller
Joined: May 03, 2000 Posts: 5927 Location: back to living where hell meets the suface
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Posted: Sun Jun 07, 2009 10:40 pm Post subject: |
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Roadcow wrote: |
Maxton Update
Bruce Cook DSS new Record on first pass 99.8 mph on a 1493cc engine
Tom Bruch SSS new Record 90 mph and change on a 1415cc engine using stock carb and intake manifold. |
Pictures
Also a question; Can you run a dry sump in the DSS class? Planning the 36 type 2 land speed DSS engine and the question was brought up _________________ Stocking distributor of "The Funky Green Panels"
www.BUSTORATION.com metal and more for your bus
"no more hacking my sig line" |
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36hplandspeedracer Samba Member
Joined: January 30, 2006 Posts: 847 Location: Ivins, Utah
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Posted: Mon Jun 08, 2009 6:15 am Post subject: Dry sump ? |
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A dry sump oil system would pass the "guidelines" if the components utilized were availalble prior to 1965 since it could improve performance. A "full flow" oil system is acceptable since it only contributes to reliability, not performance.
Burly |
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spookymulder Samba Proletariat
Joined: January 02, 2004 Posts: 3298 Location: I'm either at 95608, 97537 or 94708 only my CPA knows for sure
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Posted: Thu Jun 11, 2009 7:36 pm Post subject: |
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Ronnie you must be the "Cybil" of the bus world! You have one lowered, one raised , one stock, one racer, one original paint, one restored, yep you truly are a multi personality bus owner |
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Unkl Ian Samba Member
Joined: September 11, 2008 Posts: 288 Location: Near Toronto
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Posted: Thu Jul 30, 2009 1:57 pm Post subject: Re: BruKrasa 36hp singleport heads |
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Tom have you got some comparison numbers for the exhaust flow ?
bvilletom wrote: |
After about a year and a half of work, ... I have worked out a whole system from combustion chamber to carburetor entrance that out flows the Okrasa set.
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bvilletom Samba Member
Joined: January 22, 2006 Posts: 95 Location: cedar rapids iowa usa
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Posted: Thu Aug 06, 2009 4:05 pm Post subject: Exhaust Airflow Numbers |
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Yes, Uncle Ian. I will post a bunch of 36hp exhaust flow numbers soon.
Also I will describe some interesting facts & observations between the Okrasa heads, stock heads, and modified heads. At first I didn’t work much with the exhaust flow on the 36 head because the stock exhaust valve flows are very close to the same as the intake. This bothered me so I concentrated on the intake only. Now the intake side of things are going pretty well with the Cook, Blackline, and Brukrasa modified single port heads. The exhaust flow numbers are very similar to late 1600 heads.
BvilleTom _________________ bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction |
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Unkl Ian Samba Member
Joined: September 11, 2008 Posts: 288 Location: Near Toronto
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Posted: Thu Aug 06, 2009 6:52 pm Post subject: Re: Exhaust Airflow Numbers |
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Yes, modern race heads are typically ported so the exhaust flows
60-80% of intake. Depends on the application, and builder.
bvilletom wrote: |
Also I will describe some interesting facts & observations between the Okrasa heads, stock heads, and modified heads. |
Looking forward to it. |
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Unkl Ian Samba Member
Joined: September 11, 2008 Posts: 288 Location: Near Toronto
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Posted: Thu Aug 06, 2009 6:54 pm Post subject: Re: Exhaust Airflow Numbers |
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bvilletom wrote: |
Now the intake side of things are going pretty well with the Cook, Blackline, and Brukrasa modified single port heads. |
What class are you guys running this year ?
Going to take another run at NA36 ? |
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bvilletom Samba Member
Joined: January 22, 2006 Posts: 95 Location: cedar rapids iowa usa
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Posted: Tue Aug 11, 2009 4:58 pm Post subject: 36 HP Air Flow worksheet |
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Posted are air flow summary sheets for two different 36 HP engines both with stock size valves and stock intake flanges. These both would be much better with big ports and bigger valves but this is just baseline information. The left side shows the average flow of 8 stock 36 heads. The far right side shows stock Okrasa flows, which has been my goal to equal or exceed. The center section shows a port by port intake and exhaust flow of a pair of heads identified to each port by the castings number and the date code. You will notice that all of the heads vary a little inflow from port to port because of valve head shape. Some are tulip shaped, some are flat, etc. The seat and throat shape, as well as the slight differences in port shapes and where the porting tool may have slipped a bit. On the modified intake sheet (4-27-09) the intake flows look better since I cut the guides off slightly to get more lift because of the use of high lift rockers and cam. The sheet from 04-27-09 is of the heads I ran at Maxton, NC in May, 2009 in the SSS (super stock single) class at 90.2 MPH.
Back to the exhaust, the Okrasa head slants the intake seat side of the exhaust port toward the exhaust flange quickly and the long side (top) of the port is raised toward the valve cover 1-2 mm. The best part of the exhaust port is that the short side port radius is about 5 mm higher into the port, causing less flow separation. Also the port just out from the valve guide boss widens out to about 35-36 mm and then blends into the long side radius. It is just about a “D” shaped port in the middle.
I measure all the ports with an inside caliper on the X & Y axis to plot out these diameters and shapes. I now flow all the ports without valves and actually get a before, during and after flow to get the port shape right. The whole key to getting flow is the right internal shape of the port. Bigger is not always better! Velocity works wonders. After that I get the valve shape, back cuts or whatever to make it work. With every set of heads that I’m doing now, I’m learning and improving the flow.
I could write a thread, if there is enough interest, of step by step instruction on how to port 36 heads, where to grind and where not to touch it.
Sheet #2 is coming soon.
Bville Tom
_________________ bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction |
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Shorrock Samba Member
Joined: January 02, 2005 Posts: 433
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Posted: Tue Aug 11, 2009 5:12 pm Post subject: Re: 36 HP Air Flow worksheet |
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bvilletom wrote: |
I could write a thread, if there is enough interest, of step by step instruction on how to port 36 heads, where to grind and where not to touch it.
Sheet #2 is coming soon.
Bville Tom |
Tom,
Better yet would be to find an interested shop that would follow your directions, map and document your heads so that I can send my set of NOS heads for Brukrasa setup preferably with bigger valves. The shop should cut you a check, small or otherwise, for each Brukrasa head made. Heck tell me where to send them and I'll cut you the check. I sincerely appreciate all your research and more importantly you willingness to freely share it.
I have given up on finding one more Denzel head so am ready to start working on my NOS 36hp heads. I also need to get the chambers/piston tops (pre-a supers) matched. One thing at a time. Heads!
Please |
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Unkl Ian Samba Member
Joined: September 11, 2008 Posts: 288 Location: Near Toronto
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Posted: Tue Aug 11, 2009 5:59 pm Post subject: |
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Tom: Are you flow testing with a straight pipe on the exhaust,
and a radius on the intake port ? |
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Unkl Ian Samba Member
Joined: September 11, 2008 Posts: 288 Location: Near Toronto
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Posted: Tue Aug 11, 2009 6:00 pm Post subject: Re: 36 HP Air Flow worksheet |
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Shorrock wrote: |
I have given up on finding one more Denzel head so am ready to start working on my NOS 36hp heads. |
Maybe Tom would be interested in flow testing the Denzel head.
Some people think they are superior to the Okrasa. |
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bvilletom Samba Member
Joined: January 22, 2006 Posts: 95 Location: cedar rapids iowa usa
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Posted: Tue Aug 11, 2009 6:45 pm Post subject: Flow bench |
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U Ian
I am flowing the exhaust right out of the flange, you can make the numbers better with a pipe i know. On the intake I Just break the sharp edge with some sandpaper. I am interested in the basic numbers without all the B S fluff.
Bvilletom _________________ bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction |
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Shorrock Samba Member
Joined: January 02, 2005 Posts: 433
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Posted: Tue Aug 11, 2009 7:43 pm Post subject: Re: 36 HP Air Flow worksheet |
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Unkl Ian wrote: |
Shorrock wrote: |
I have given up on finding one more Denzel head so am ready to start working on my NOS 36hp heads. |
Maybe Tom would be interested in flow testing the Denzel head.
Some people think they are superior to the Okrasa. |
Tom,
I would be more than happy to send you the Denzel head for flow testing, if you want to take the time to do it.
Just let me know and it is on the way.
Maybe all the hype about the Denzel head is just that!
Howard |
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TomSimon Samba Member
Joined: January 13, 2004 Posts: 751
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Posted: Tue Aug 11, 2009 9:55 pm Post subject: Re: 36 HP Air Flow worksheet |
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[quote="Shorrock"][quote="Unkl Ian"]
Shorrock wrote: |
Maybe all the hype about the Denzel head is just that!
Howard |
I have looked at many drag race heads over the years, have two sets myself of type 1 heads that support 300hp on a 2.5 liter naturally aspirated... I had a chance to look at 36hp single, Okrasa 36hp DP, and Denzel 36hp DP... my educated eye would bet big money that if all things are equal, the stock Denzel head and manifold will outflow stock Judson by 20-30%.
Having made a bold statement, which I am not in the habit of doing, the flowbench will tell you for sure... dynoing an engine with those heads will tell the tail.
Last edited by TomSimon on Sat Aug 15, 2009 7:02 am; edited 1 time in total |
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grueni Samba Member
Joined: November 03, 2008 Posts: 582 Location: Germany
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Posted: Wed Aug 12, 2009 1:42 am Post subject: Re: 36 HP Air Flow worksheet |
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bvilletom wrote: |
I could write a thread, if there is enough interest, of step by step instruction on how to port 36 heads, where to grind and where not to touch it.
Sheet #2 is coming soon.
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there is big interest tom,...your work and your instruction will make you the mr. okrasa of single port for me.
you and the work from oval56 here in germany inspired me to build my singleports that will tested soon.
you have PM |
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Art Thraen Samba Member
Joined: January 19, 2004 Posts: 478 Location: Utah
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Posted: Sat Aug 15, 2009 6:29 am Post subject: Blackline 57 Engines lower end, Look at |
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Blackline 57 Engines lower end, Look at cam clearence, or lack of
Look at the installed 1500cc barrels, clearenced for pushrod tubes
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TomSimon Samba Member
Joined: January 13, 2004 Posts: 751
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Posted: Sat Aug 15, 2009 7:19 am Post subject: |
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Hey Art, looking at the picture of the rod cap to cam lobe...
if a 36hp engine uses the same cam gear as a 1600, why the clearence issue with only a 74 stroke? You and I have both built big stroker T1 engines |
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Art Thraen Samba Member
Joined: January 19, 2004 Posts: 478 Location: Utah
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Posted: Sat Aug 15, 2009 9:30 am Post subject: |
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Because the engine is smaller, but the cam/crank spred is the same.. But this is just how it worked out.. Close! |
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grueni Samba Member
Joined: November 03, 2008 Posts: 582 Location: Germany
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Posted: Sat Aug 15, 2009 9:39 am Post subject: |
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because the cam's from the camshaft sit on different places than typ1.
hold a typ1 cam next to a 36hp cam than you can see why (crankshafts also have other dimensions) |
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Art Thraen Samba Member
Joined: January 19, 2004 Posts: 478 Location: Utah
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Posted: Sun Aug 16, 2009 8:43 am Post subject: |
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Yes the lobes are closer together.. closer to the rods, not so much between them. |
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