BIG BLOCK FORD
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Jon Kaase SR71 Cylinder Heads

+58
CDMBill
Carbguy
jasonf
SandHillsHillbilly
cletus66
BOSS 429
Lukesportsman
738drvr
Ol'Blue77
Mikejc
6t6mustang
MidnightbluS10
psfracer
c.evans
res0rli9
terryk105
IDT-572
stanger68
BBF552
Dave De
HorsinAround
BigBlockRanger
ED468
fordsrgrt
nitrous.f
Carl
windsor
boss9coupe
Mark Miller
nuclearcobra
Stimie
Curt
Mark O'Neal
cobrakid8
Coupe Devil
whatbumper
STR-LGL-70
DGS
Gary Blair
glenevans
Paul Kane
litshoot
68formalGT
hbstang
jonkaase
68galaxie
JBR-3
dfree383
nascar429
TravisRice
rmcomprandy
jbozzelle
BBFTorino
wayney
bruno
Lem Evans
enginetech
Doug Rahn
62 posters

Page 6 of 10 Previous  1, 2, 3, 4, 5, 6, 7, 8, 9, 10  Next

Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 8th 2018, 9:02 pm

Jon Kaase SR71 Cylinder Heads - Page 6 Ggg10
Jon Kaase SR71 Cylinder Heads - Page 6 Fff10

I know this is pretty much unbelievable, but this went past our goal. First sheet is with cam at 113, second is at 116. Timing at 28. It took 5 runs before these sheets to get the carbs right. 6 cylinders were way rich and the front two needed fuel. It would be hard to figure out without all 8 O2 sensors on the primary pipes. Special thanks  to Billy Godbold at Comp Cams for making 2 new lobes for me. This engine has 179 gram steel intake valves, stud rockers with no stud girdle, and Manley Nextek dual springs with 250# on the seat and 750# open. Trend 3/8 pushrods, .135 wall.  It still sounds like it wants more at 8100. Since we were going over 8000 rpm I started it a little higher than the other runs. Peak torque was below the starting RPM.

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  BBF552 November 8th 2018, 9:26 pm

What fuel are you using for the 598 tests?
BBF552
BBF552

Posts : 34
Join date : 2014-08-17
Age : 34
Location : Charles City, Virginia

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle November 8th 2018, 10:17 pm

Dave De wrote:The stud bosses on these heads seem to be higher than the P-51's. This makes the rocker trunnion closer to the base of the stud where its going to be stronger from side loading. Push rod lengths are much longer at 9.400 and 9.450.

Piston valve relief clearance
My Diamond piston reliefs were cut for modified P-51's with 2.300" diameter intake valves. The valves on the SR-71's are 2.375" where I expected interference. I checked the clearance to find that it has .160" radial clearance in the relief. This tells me that the valve centerline is closer to the piston center than the P-51 head. Those of you that have pistons with reliefs for SCJ/P-51's with 2.25" valves should have less clearance to something around .130" which is acceptable clearance where you wont have to cut the pistons. But you need to check it to make sure.

Thanks for the info. Been pondering a set of the SR-71s and a cam swap on my 514 here soon... Good to know the pistons may be able to stay in the block...

jbozzelle

Posts : 3698
Join date : 2009-08-10
Age : 47
Location : New Orleans

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle November 8th 2018, 10:18 pm

2 horsepower per cubic inch is nothing to sneeze at from the 598 test mule!

jbozzelle

Posts : 3698
Join date : 2009-08-10
Age : 47
Location : New Orleans

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  stanger68 November 8th 2018, 11:54 pm

BBF552 wrote:What fuel are you using for the 598 tests?

X2- I was wondering the same thing. Is this with alcohol or gas?

stanger68

Posts : 385
Join date : 2015-12-05
Location : Birmingham, Al

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 9th 2018, 9:43 am

This is a maximum effort for sure. So the fuel is VP, Q-16. It's the best fuel I've ever seen for not hurting parts. Too much timing? just less power. Too lean, like over 16 to 1 air/fuel? no problem. C-16 VP is about the same power. But on this engine with 16 to 1 compression, C-12 or C-14 VP would probably hurt the rings

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  STR-LGL-70 November 9th 2018, 10:19 am

Jon,
I read through all of the posts for some idea of the cam specs you used but didn't see anything. Could you give us some specifics w/o going too much in detail? I just picked up some C heads and am almost kicking myself for the cost diff vs hp gain compared to the sr71 heads with being able to use the manifolds, headers, etc I already own.
Thanks, Sheldon
STR-LGL-70
STR-LGL-70

Posts : 223
Join date : 2009-08-06
Age : 58
Location : Daytona FL

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 9th 2018, 10:23 am

The C heads ported right are a good 100 better. so don't worry. the cam is Comp, 287-312 at .050 115 CL, .483" lobe lift.

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 9th 2018, 10:49 am

Jon Kaase SR71 Cylinder Heads - Page 6 A13
It's not very often that you can make over 1200 HP, N.A. with $450 rockers

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  Lem Evans November 9th 2018, 10:56 am

Comp 1830-16?

Lem Evans

Posts : 7366
Join date : 2008-12-03
Location : Livermore , Ky

http://bfevansraceparts.com

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle November 9th 2018, 11:03 am

Looks like them...

jbozzelle

Posts : 3698
Join date : 2009-08-10
Age : 47
Location : New Orleans

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 9th 2018, 11:15 am

yes.... Comp 1830-16

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  nuclearcobra November 9th 2018, 1:29 pm

Your ideas are incredible , Even your P38's , I put them on a 86 junk yard 5.0 short block with a small flat hyd cam 244@.050 and 534 lift and ran 10.80 at 121 mph with a 125 shot at 3050lb tripping the 60' box on the rear tires , and have been equally impressed with the SCJ's outta the box on a solid flat tappet flat top piston 472 and the P51's on a solid flat tappet 552 So thanks for all the killer creations you offer us , I think i might have to get a set of these SR71's to help with my hoarding hobby Very Happy


Last edited by nuclearcobra on November 10th 2018, 8:27 am; edited 1 time in total
nuclearcobra
nuclearcobra
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 1385
Join date : 2009-08-16
Location : Delaware Coast

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  IDT-572 November 9th 2018, 5:01 pm

Jon, will you have a stud girdle in time to test on this engine. Be a great one to see if there is some power to be had with one.
IDT-572
IDT-572
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 4628
Join date : 2008-12-02
Age : 60
Location : Shelbyville Tn.

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle November 9th 2018, 6:55 pm

IDT-572 wrote:Jon, will you have a stud girdle in time to test on this engine. Be a great one to see if there is some power to be had with one.

Curious about this too...

jbozzelle

Posts : 3698
Join date : 2009-08-10
Age : 47
Location : New Orleans

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  68galaxie November 9th 2018, 7:36 pm

Fantastic results John.

The AFR 315 heads have a 3.44 square inch CSA minimum (published)
How do the P51 and SR-71 heads compare.

Doing some PipeMax work and am curious about port sizing.

Cheers!
68galaxie
68galaxie

Posts : 340
Join date : 2010-04-13
Location : Edmonton AB

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 9th 2018, 7:49 pm

I will try to do some measuring for you.

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  terryk105 November 10th 2018, 4:53 am

jonkaase wrote:The C heads ported right are a good 100 better.

Hi Jon

Where will the SR71 be with porting? and what about your A460?

Cheers
Terry

terryk105

Posts : 1
Join date : 2018-11-09

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 10th 2018, 7:54 pm

i checked some sizes of intake ports. The areas figured in the corner radius’s. The P-51 and SR-71 heads have more corner radius in the roof than the AFR ‘s and that is figured in. Overall the sq in area is hard to measure but these are close

AFR. Pushrod pinch, 2.12 x 1.73, 3.45 sq in. Short turn, 1.9 x 2.16, 3.8 sq in. (Height x width)

P-51. 2.1 x 1.78 3.45. 1.9 x 2.15. 3.63

SR-71. 2.3 x 1.85. 4.04. 2.15 x 2.3. 4.41

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase November 10th 2018, 8:00 pm

Sorry but listing this at home on my Ipad, it scooted all the numbers together and I can’t edit it back

jonkaase

Posts : 81
Join date : 2009-08-10

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  68galaxie November 10th 2018, 9:42 pm

jonkaase wrote:i checked some sizes of intake ports. The areas figured in the corner radius’s. The P-51 and SR-71 heads have more corner radius in the roof than the AFR ‘s and that is figured in. Overall the sq in area is hard to measure but these are close

AFR.     Pushrod pinch,  2.12 x 1.73,   3.45 sq in.        Short turn, 1.9 x 2.16,   3.8 sq in.  (Height x width)

P-51.                                 2.1 x 1.78       3.45.                                     1.9 x 2.15.   3.63

SR-71.                              2.3 x 1.85.       4.04.                                     2.15 x 2.3.   4.41


Thank you!!
68galaxie
68galaxie

Posts : 340
Join date : 2010-04-13
Location : Edmonton AB

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  res0rli9 November 11th 2018, 2:34 am

I see more engine masters victory's

res0rli9
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 3351
Join date : 2008-12-02
Age : 71
Location : sarasota FL.

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  c.evans November 12th 2018, 3:22 pm

To Blake and J. Bozelle,

I sent an assembled SR-71 head to Jon Best at Jomar a couple of weeks ago. They are making the stud girdles now and have a P/N assigned for the SR-71 heads.

c.evans
BBF VENDOR SPONSOR
BBF VENDOR SPONSOR

Posts : 2260
Join date : 2008-12-03

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle November 12th 2018, 3:51 pm

I saw that on Facebook Charlie.

jbozzelle

Posts : 3698
Join date : 2009-08-10
Age : 47
Location : New Orleans

Back to top Go down

Jon Kaase SR71 Cylinder Heads - Page 6 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  IDT-572 November 12th 2018, 5:07 pm

Charlie,

I did too , just hoping jon will get them in time to make a pull or two with them on the engine.
IDT-572
IDT-572
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 4628
Join date : 2008-12-02
Age : 60
Location : Shelbyville Tn.

Back to top Go down

Page 6 of 10 Previous  1, 2, 3, 4, 5, 6, 7, 8, 9, 10  Next

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum