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by maxracesoftware
Fri Sep 25, 2020 3:47 pm
Forum: Engine Tech
Topic: NA Engine With No Damper?
Replies: 11
Views: 144

Re: NA Engine With No Damper?

That's actually surprising. I did a smaller damper on a 347ci SBF making 485 rwhp, and it picked up a few hp on the same dyno. Talking ~1%. WoO Sprints don't run a damper either. Coincidentally, Engine Masters released an episode on Motor Trend this morning on this very subject. They ran with a hea...
by maxracesoftware
Fri Sep 25, 2020 3:25 pm
Forum: Engine Tech
Topic: NA Engine With No Damper?
Replies: 11
Views: 144

Re: NA Engine With No Damper?

the right dampener will actually gain you power. i did a bunch of different Damper tests for Troy Coughlin's (Jegs) NHRA ProStocker in 1994 ATI , Rattler, Fluid Damper, etc. and then i personally did a bunch on various engines i had in my Shop -vs- no Damper you will always loose TQ and HP if you r...
by maxracesoftware
Wed Sep 23, 2020 4:25 am
Forum: Engine Tech
Topic: Header Tube and Collector Specs "Trends"
Replies: 41
Views: 2173

Re: Header Tube and Collector Specs "Trends"

Larry M - thank you! for all of the pics and details! It sounds like I need to get pipemax (Needed to 8-10 years ago haha) when you get your new update done. Here is another question about the “trends” — do try- y’s need the primary and secondaries together to be as long as 4 into one primaries? I’...
by maxracesoftware
Sun Sep 20, 2020 3:44 pm
Forum: Engine Tech
Topic: NHRA 283cid Stocker Engine
Replies: 7
Views: 515

Re: NHRA 283cid Stocker Engine

example File included with PipeMax v4.50 installation :
NHRA_Stocker_LSA_Chevy283_BES_6500RPM_373HP_5000RPM_342TQ.PMW
by maxracesoftware
Sun Sep 20, 2020 3:03 pm
Forum: Engine Tech
Topic: NHRA 283cid Stocker Engine
Replies: 7
Views: 515

Re: NHRA 283cid Stocker Engine

VITAL SPECIFICATIONS: NHRA LEGAL STOCK ELIMINATOR 283 CHEVY BORE – 3.935 INCHES STROKE – 3.013 INCHES DISPLACEMENT – 293.1 CID COMPRESSION RATIO – 10.6:1 CAMSHAFT – BULLET HYDRAULIC FLAT-TAPPET CAM DURATION – 258/260 DEGREES AT 0.050 VALVE LIFT – 0.399 INCH ROCKER ARMS – CRANE BALL PIVOT STAMPED ST...
by maxracesoftware
Sun Sep 20, 2020 3:01 pm
Forum: Engine Tech
Topic: NHRA 283cid Stocker Engine
Replies: 7
Views: 515

Re: NHRA 283cid Stocker Engine

American Sprint Car Series (ASCS) 360cid
put out more than 700 hp and close to 600 lb.-ft. of torque on Methanol
need minimum of 14.5:1 compression
most use : 2-Step 1.625 , 1.750 Tube OD

so how can a much smaller NHRA 283cid with only 373 Peak HP
use same Header Tube OD sizes ???
by maxracesoftware
Sun Sep 20, 2020 2:59 pm
Forum: Engine Tech
Topic: NHRA 283cid Stocker Engine
Replies: 7
Views: 515

Re: NHRA 283cid Stocker Engine

example File included with PipeMax v4.50 installation :
NHRA_Stocker_LSA_Chevy283_BES_6500RPM_373HP_5000RPM_342TQ.PMW
by maxracesoftware
Sun Sep 20, 2020 2:59 pm
Forum: Engine Tech
Topic: NHRA 283cid Stocker Engine
Replies: 7
Views: 515

NHRA 283cid Stocker Engine

NHRA 283cid Stocker Engine - modeled in PipeMax v4.50

example File included with PipeMax v4.50 installation :
NHRA_Stocker_LSA_Chevy283_BES_6500RPM_373HP_5000RPM_342TQ.PMW
by maxracesoftware
Sun Sep 20, 2020 2:18 am
Forum: Engine Tech
Topic: using SF Air Turbine to determine Header problems
Replies: 36
Views: 1289

Re: using SF Air Turbine to determine Header problems

Pictures on measuring Port CenterLine Lengths :
you then carefully pull the Tape out the Port
and measure its Length with Dial Calipers .
by maxracesoftware
Sat Sep 19, 2020 8:28 pm
Forum: Engine Tech
Topic: using SF Air Turbine to determine Header problems
Replies: 36
Views: 1289

Re: using SF Air Turbine to determine Header problems

Thanks for the explanation Larry. When doing the roof, I take it that the valve guide is not present at that point, so you can just let the tape easily follow the contour. Then you install the guide and valve and drip it with those items in place for the cc volume? no, the guide and/or guide boss a...
by maxracesoftware
Sat Sep 19, 2020 1:39 pm
Forum: Engine Tech
Topic: using SF Air Turbine to determine Header problems
Replies: 36
Views: 1289

Re: using SF Air Turbine to determine Header problems

Larry, Just out of curiosity, how do you determine port centerlines? i use Scotch 3M 218 Fine Line Tape to measure Roof and Floor Lengths + a Fine Point Sharpie to mark location across the tape Cylinder Head's Intake or Exhaust Port CenterLine Length in Inches ( the Length thru the centerline of th...
by maxracesoftware
Sat Sep 19, 2020 4:21 am
Forum: Engine Tech
Topic: Read these plugs please
Replies: 4
Views: 309

Re: Read these plugs please

Compression is 10:1 (9.97:1 if you want to nitpick), it’s had a few WOT pulls on it recently but mostly just regular driving. I’ll try to get a better pic this weekend after I’ve put a few miles on a couple of fresh plugs. Plugs are champion RC12YC’s, as recommended by the head manufacturer as a st...
by maxracesoftware
Sat Sep 19, 2020 12:50 am
Forum: Engine Tech
Topic: Read these plugs please
Replies: 4
Views: 309

Re: Read these plugs please

A little fat at idle? About 200 miles on these... A5705143-1051-47A0-875D-A7AD0AB03A1E.jpeg 76963B2F-B8A1-4618-973A-0E820F5C4345.jpeg A little fat at idle? About 200 miles on these... it looks a little rich , hard to tell exactly ? Also what is your Compression Ratio ?? after zooming in + i may hav...
by maxracesoftware
Fri Sep 18, 2020 7:35 pm
Forum: Engine Tech
Topic: Specific Torque
Replies: 13
Views: 624

Re: Specific Torque

David's assessment is absolutely correct, but lb-ft/c.i. has the advantage of being just a single division operation away from the most readily available raw data. There are other B.M.E.P. factors however, such as the difficulty of attaining a given value at say 15,000 RPM vs. 5,000 and the effect ...
by maxracesoftware
Fri Sep 18, 2020 1:07 pm
Forum: Engine Tech
Topic: Specific Torque
Replies: 13
Views: 624

Re: Specific Torque

A calculation of Specific Torque, while useful, does not consider the effect of engine speed. The method used to compare the state of tune of various engines is to normalize for engine size and engine speed. The calculated value is called Brake Mean Effective Pressure (BMEP). It reflects the averag...