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Search found 290 matches

by NormS
Fri Oct 15, 2021 10:02 am
Forum: Engine Tech
Topic: Shiny or black carb for heat
Replies: 44
Views: 1479

Re: Shiny or black carb for heat

My experience has been that,black absorbs way more heat, both in radiant heat from the engine and the hot air blast from the radiator.
by NormS
Tue Oct 12, 2021 9:44 am
Forum: Engine Tech
Topic: Reverse Acceleration on Engine Dyno
Replies: 5
Views: 656

Re: Reverse Acceleration on Engine Dyno

Or a pulling truck. About the only competition application, where deceleration pulls make sense.
by NormS
Thu Oct 07, 2021 1:59 pm
Forum: Engine Tech
Topic: AFR "curve" - flat or trending lean after tq peak?
Replies: 12
Views: 671

Re: AFR "curve" - flat or trending lean after tq peak?

Yes, 'train wreck' is an appropriate term for the distribution in many intakes, particularly 2 plane intakes. The late Harold Bettes, told me more than once, that "intakes manifolds are some of the worst devises ever invented by mankind". Once we got to using a data acquisition system with 10 channe...
by NormS
Thu Oct 07, 2021 10:33 am
Forum: Engine Tech
Topic: AFR "curve" - flat or trending lean after tq peak?
Replies: 12
Views: 671

Re: AFR "curve" - flat or trending lean after tq peak?

It depends on the combustion efficiency of the engine. For those not so efficient engines, a "flat" A/F ratio curve tends to yield the best overall power curve. For more efficient engines, a leaning trend as the rpm's increase, is usually what they like. Do not assume that BSFC numbers are a direct ...
by NormS
Sun Sep 26, 2021 12:18 pm
Forum: Engine Tech
Topic: trouble setting floats on 3310 holley
Replies: 17
Views: 1033

Re: trouble setting floats on 3310 holley

Setting float levels with the engine off, requires you to submerge the floats much deeper in the the fuel to try to control the fuel levels. If you are using an conventional regulator, doing that with the engine off will also, most likely, give you fuel pressure that is much higher than you want, du...
by NormS
Sat Sep 25, 2021 3:54 pm
Forum: Engine Tech
Topic: trouble setting floats on 3310 holley
Replies: 17
Views: 1033

Re: trouble setting floats on 3310 holley

What you're experiencing, is one of the scenarios that occurs when you try to set float levels with the engine not running. Also, if you are using a conventional restriction type fuel pressure regulator, fuel pressure will creep up to whatever an electric pump is putting out, if you are not running ...
by NormS
Fri Sep 24, 2021 3:07 pm
Forum: Engine Tech
Topic: trouble setting floats on 3310 holley
Replies: 17
Views: 1033

Re: trouble setting floats on 3310 holley

A couple things to look at. 1) The 3310 bowls should take needle and seat assemblies that are 1.450" overall length. There are some assembles that are 1.500" overall length... those may not allow you to get the fuel levels up to the bottom of the sight holes. 2) Float levels should always be set wit...
by NormS
Wed Jun 09, 2021 11:45 am
Forum: Engine Tech
Topic: Engine dyno Competitions
Replies: 9
Views: 1389

Re: Engine dyno Competitions

You would think we would have heard something by now. The silence is not encouraging.
by NormS
Wed Jun 09, 2021 9:09 am
Forum: Engine Tech
Topic: Engine dyno Competitions
Replies: 9
Views: 1389

Engine dyno Competitions

Has anyone heard anything about the Race Engine Challenge or the Masters of Motors competitions for '21 ? I haven't heard anything, and neither has anyone I know. It appears that they have been cancelled again, but I hope that isn't the case.
by NormS
Mon Apr 26, 2021 11:08 am
Forum: Engine Tech
Topic: Depac tach signal generator
Replies: 23
Views: 1447

Re: Depac tach signal generator

Hi Mario. I sent some info to you in a private message. Norm/CFS
by NormS
Sun Apr 25, 2021 5:54 am
Forum: Engine Tech
Topic: Depac tach signal generator
Replies: 23
Views: 1447

Re: Depac tach signal generator

Yes Mario. The Depac tach signal generator is a stepper motor. There are many different sizes and configurations of steppers. I’ll look up the specs for the ones that work with the Depac, and get that info to you. Norm/CFS
by NormS
Mon Mar 15, 2021 1:22 pm
Forum: Engine Tech
Topic: Nitrous and carburetors..... need some skooling
Replies: 4
Views: 401

Re: Nitrous and carburetors..... need some skooling

Hi Russ. A great carb is one that gives the engine good low speed/part throttle drivability, transitions to full throttle fast and clean, and meters fuel well over a broad rpm range at full throttle, particularly in the upper half of that range. For many engines, making good power in a wide rpm rang...
by NormS
Sat Mar 06, 2021 11:57 am
Forum: Engine Tech
Topic: Edelbrock carb tuning
Replies: 123
Views: 3777

Re: Edelbrock carb tuning

With the amount of intake manifold vacuum you have , I suspect that the primary butterflies are too far open at idle, exposing too much of the transition slots beneath them.This can make the idle mixture too rich, even with the mixture screws turned way in, and can cause an off idle stumble. You may...
by NormS
Fri Feb 19, 2021 12:58 pm
Forum: Engine Tech
Topic: Any freshwater boat engine experts here?
Replies: 21
Views: 1037

Re: Any freshwater boat engine experts here?

My brother and I ran flat bottom v-drive boats for decades. We always used the jabsco water pumps, and on most of the engines(All Big block chevies), we put the water into the engine through the drain plug holes, just above the pan rails. We went up on size of those 2 holes, because we felt that the...
by NormS
Sat Feb 13, 2021 12:53 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Anyone grinding cams for Desoto Hemis?
Replies: 26
Views: 1841

Re: Anyone grinding cams for Desoto Hemis?

Try Camcraft Cams in Arden N.C. 828-681-5183