Search found 735 matches

by #84Dave
Sun Dec 04, 2016 5:55 pm
Forum: Engine Tech
Topic: header flanges drawings
Replies: 3
Views: 1291

Re: header flanges drawings

You might also look at headersbyed.com
by #84Dave
Sat Aug 27, 2016 5:26 pm
Forum: Engine Tech
Topic: Header Kits
Replies: 10
Views: 2100

Re: Header Kits

I've used Schoenfelds product for years, building my own headers. They sell a BIG box, 36' worth, of misc. bends for about $180. Stepped headers might widen the power band a bit. They might include a couple of pipe sizes in their big box of bends for the 'step' process? They also manufacture flanges...
by #84Dave
Sat Aug 27, 2016 4:44 pm
Forum: Engine Tech
Topic: Intake Valve Size ?
Replies: 27
Views: 13775

Re: Intake Valve Size ?

DV might suggest an intake valve size of 51-52 % of bore size. Then he might also suggest an exhaust valve size of 75-78 % of the intake valve diameter? -Dave-
by #84Dave
Wed Aug 26, 2015 1:53 pm
Forum: Engine Tech
Topic: CNC Head Porters Northwest
Replies: 5
Views: 1278

Re: CNC Head Porters Northwest

Chapman Heads in Utah? They're the best in the west! #84Dave
by #84Dave
Mon May 18, 2015 1:01 pm
Forum: Engine Tech
Topic: Reliable piston suppliers?
Replies: 32
Views: 5403

Re: Reliable piston suppliers?

We've always had great service from WiseCo in OH. They 'build' us to any reasonable piston spec. Dave
by #84Dave
Mon May 11, 2015 3:02 pm
Forum: Engine Tech
Topic: Step okay from exhaust port to header tube?
Replies: 62
Views: 11079

Re: Step okay from exhaust port to header tube?

The pipe formula...... one more time: Peak Torque RPM = Pipe ID cross-section area(square inches) x 88,200/(divided by) single-cylinder volume in cubic inches. -Dave-
by #84Dave
Mon May 11, 2015 12:21 pm
Forum: Engine Tech
Topic: Step okay from exhaust port to header tube?
Replies: 62
Views: 11079

Re: Step okay from exhaust port to header tube?

The primary pipe ID of the header is solidly linked to peak TORQUE rpm, similar to intake manifolds. The following equation for determining the relationship between pipe ID size, single-cylinder displacement, and the peak-TORQUE rpm point is very helpful for determining your engine properties/needs....
by #84Dave
Thu Apr 30, 2015 6:49 pm
Forum: Engine Tech
Topic: radiator question
Replies: 40
Views: 4614

Re: radiator question

In the latest issue of the performance magazine, Speedway Illustrated, there is an outstanding article regarding the cooling fan/shroud assemblies. Mechanical or electric. The article is very technical in nature. -Dave-
by #84Dave
Tue Apr 14, 2015 1:37 pm
Forum: Engine Tech
Topic: solid billet roller cam and lifter life span question
Replies: 18
Views: 4880

Re: solid billet roller cam and lifter life span question

Mike Jones has the experience, along with many others, but we're quickly finding out here that the relatively new Isky roller follower may be the way most will go. No needle bearings....... a solid bearing with pressure oil. We run the things 7600-7800 all day/night long in a SBC on short paved oval...
by #84Dave
Sun Apr 12, 2015 2:41 pm
Forum: Engine Tech
Topic: Distributor cap longevity with CD Ignition.
Replies: 19
Views: 3020

Re: Distributor cap longevity with CD Ignition.

Walter x 2! I discovered cap ventilation 30 years ago, when we began to run/use the new, at that time, MSD-6 analog ignition box. We race short-track paved ovals. Without the ventilation, the distributor cap would last about 7 races out of a 20-race season schedule. The plug terminals would arc-pit ...
by #84Dave
Sun Apr 12, 2015 1:18 pm
Forum: Engine Tech
Topic: More HP from spark plug gap
Replies: 15
Views: 6459

Re: More HP from spark plug gap

In 30 years of running SBC's on short paved-oval tracks, I always drill .25" vent holes directly under all (8) plug-wire terminals in the distributor cap. I discovered very early on that excessive ionization inside the cap, with a good electronic ignition box, can be a power killer. Irregardles...
by #84Dave
Mon Apr 06, 2015 11:32 am
Forum: Engine Tech
Topic: Mild-ish 454 BBC Valve Spring Recommendation
Replies: 7
Views: 2672

Re: Mild-ish 454 BBC Valve Spring Recommendation

Talk to Comp Cams & see if they may recommend their relatively new 'Conical' spring. They're good for frequency suppression. -Dave-
by #84Dave
Sat Mar 28, 2015 11:32 am
Forum: Engine Tech
Topic: Spark plug voltage requirement
Replies: 23
Views: 3726

Re: Spark plug voltage requirement

Good question! We out here would love that answer for 10:1/12:1/14:1 static compression ratios. The ratios used by a large % of the racing community. -Dave-
by #84Dave
Tue Dec 23, 2014 6:22 pm
Forum: Engine Tech
Topic: Ignition choice
Replies: 28
Views: 8321

Re: Ignition choice

Geek....... Initially, I had the same problem with the analog -6 at one point. Sent it back to MSD and they had to replace capacitors inside the box. The problem? Insufficient grounding to the chassis when I mounted the box. ANY MSD box MUST have a good ground. I ran a #10 wire from the box all the ...
by #84Dave
Tue Dec 23, 2014 2:57 pm
Forum: Engine Tech
Topic: Ignition choice
Replies: 28
Views: 8321

Re: Ignition choice

I have successfully used the MSD-6 box for many years. I have it checked/upgraded by MSD every (2) years for our paved-oval racing. I use a Mallory distributor. Another thing I did, which improved performance a bit, was install a 12VDC-to-16VDC converter to power the MSD unit. The MSD box will accep...