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Search found 1017 matches

by swampbuggy
Tue Feb 25, 2020 9:22 pm
Forum: Engine Tech
Topic: Best race valve material
Replies: 30
Views: 1214

Re: Best race valve material

At a constant 8000 RPM's each valve opens and closes 4000 times a minute. 4000 x 60 minutes (1 hour) = 240,000. 10,000,000 divided by 240,000 = 41.66 hours run time............that is more than i would have guessed ??? Here is a fact that boggles my mind, at 8000 RPM's each piston passes thru TDC 13...
by swampbuggy
Sat Feb 15, 2020 11:04 am
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 4935

Re: Why does a tighter lsa need more compression?

I have a 355 with 10-1 comp I run in my work truck, it has a 204* at .050" duration cam. I did a 383 street engine with 10-1 comp with a 256* at .050" duration cam. Does one of them have the right "dynamic compression" ? Randy Wouldn't one need a whole lot more information on both engines to answer...
by swampbuggy
Thu Feb 13, 2020 6:21 am
Forum: Engine Tech
Topic: Choosing the right shaft mounted rocker arms
Replies: 16
Views: 625

Re: Choosing the right shaft mounted rocker arms

I have wondered about the strength and so on about S.S. rocker arms over the years. Generally speaking S.S. is not strong as we think about high quality engine parts, however there are MANY different types of S.S. . That being said some of the S.S. rockers may be fine, however the very best steel ro...
by swampbuggy
Wed Feb 12, 2020 10:01 pm
Forum: Engine Tech
Topic: Choosing the right shaft mounted rocker arms
Replies: 16
Views: 625

Re: Choosing the right shaft mounted rocker arms

Crower Steel Shaft rockers.....good price. What are you calling a good price and what part number ?? Mark H. :?:
by swampbuggy
Tue Feb 11, 2020 7:15 pm
Forum: Engine Tech
Topic: Current NHRA Pro-Stock Cyl. heads
Replies: 10
Views: 1363

Re: Current NHRA Pro-Stock Cyl. heads

Thanks to Larry and Stan for your input. I listened to an audio interview somebody did with Mr. Godbold at Comp. Cams which prompted me to run some math calculations. One was....appx. 1500 H.P. divided by 644 C.F.M. = 2.33 H.P. per CFM . He also mentioned a percentage of the diameter of your intake ...
by swampbuggy
Tue Feb 11, 2020 6:51 am
Forum: Engine Tech
Topic: Current NHRA Pro-Stock Cyl. heads
Replies: 10
Views: 1363

Current NHRA Pro-Stock Cyl. heads

Does anybody know pretty close as to what the flow numbers are on the current Pro-Stock heads ? Mark H.
by swampbuggy
Sun Feb 09, 2020 12:14 pm
Forum: Offtopic Forum
Topic: Anyone remember the 1/4 mile fuel records?
Replies: 16
Views: 9813

Re: Anyone remember the 1/4 mile fuel records?

I know that this is an old thread but i just read it, and wanted to add this fact to the thread. Eddie Hill became the first Top Fuel driver in history to cover 1320 feet below 5.000 seconds. This run was made in 1988 at the IHRA Texas Nationals with a 4.99 second run. I could not find out when the ...
by swampbuggy
Sat Feb 08, 2020 8:19 am
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 4935

Re: Why does a tighter lsa need more compression?

Great topic, and after reading it all it causes me to think about the bigger picture. The main objective in building horsepower is when the intake valve closes have the highest possible cylinder pressure ABOVE the appx. 14.7 atmospheric pressure outside the engine. The better the cylinder heads and ...
by swampbuggy
Mon Jan 27, 2020 9:32 pm
Forum: Engine Tech
Topic: Bench Data
Replies: 144
Views: 10752

Re: Bench Data

10-4 thanks.
by swampbuggy
Mon Jan 27, 2020 8:31 pm
Forum: Engine Tech
Topic: Bench Data
Replies: 144
Views: 10752

Re: Bench Data

Chad, forgive me if it was noted earlier in this thread, what firing order did you go with ? Thanks Mark H. :)
by swampbuggy
Sat Jan 25, 2020 6:47 pm
Forum: Engine Tech
Topic: Compression
Replies: 50
Views: 2063

Re: Compression

Bill, that checking method HAS to be correct, no doubt about it. Mark H. =D>
by swampbuggy
Fri Jan 24, 2020 11:51 pm
Forum: Engine Tech
Topic: Compression
Replies: 50
Views: 2063

Re: Compression

:wink:
by swampbuggy
Thu Jan 23, 2020 6:44 am
Forum: Engine Tech
Topic: Compression
Replies: 50
Views: 2063

Re: Compression

Good day sir (Bill), have you figured your squeeze area this way before ? If so, did it show any difference than calculating on calculator/paper ? Thanks Mark H.
by swampbuggy
Wed Jan 22, 2020 7:49 pm
Forum: Engine Tech
Topic: Compression
Replies: 50
Views: 2063

Re: Compression

Here is a way to check static compression that i believe would be absolute. Lightly grease the top ring to ensure no liquid would pass by it. With the piston at B.D.C. and the spark plug hole straight up (facing ceiling) fill with a light (thin) oil such as 3 in 1, record the C.C.'s amount to the bo...
by swampbuggy
Fri Jan 17, 2020 8:36 pm
Forum: Engine Tech
Topic: King versus clevite
Replies: 29
Views: 1695

Re: King versus clevite

Af2, if the bearings do not hold up at 9000 RPM are you gonna assume its the bearings fault ???? just asking ? Mark H.