We are currently running on the new domain and server: www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 807 matches

by BradH
Thu Dec 12, 2019 2:14 pm
Forum: Engine Tech
Topic: Port texture and velocity
Replies: 22
Views: 1453

Re: Port texture and velocity

Intake ports really only need to be textured on the short side radius. The idea is that texture creates a boundary layer (changing the Reynolds number), helping to keep the flow attached as it rounds the SSR, making the turn into the cylinder. This is why a dimpled golf ball flies farther than smoo...
by BradH
Thu Dec 12, 2019 10:26 am
Forum: Engine Tech
Topic: Chris Straub has purchased Controlled Induction Software
Replies: 4
Views: 949

Re: Chris Straub has purchased Controlled Induction Software

Is this software available any longer? I can't find any active links to the product, etc. Thanks - Brad
by BradH
Thu Dec 12, 2019 10:00 am
Forum: Engine Tech
Topic: Tech Rules For The 2020 REC Dyno Contest
Replies: 7
Views: 390

Re: Tech Rules For The 2020 REC Dyno Contest

In my OPINION, the cylinder head rules as written are still not clear as to whether the port entries can be filled / raised / widened, which I know ended up being a point of debate after last year's competition: Welding/epoxy/porting within ports permitted. Ports must remain in their original as cas...
by BradH
Thu Dec 12, 2019 9:49 am
Forum: Engine Tech
Topic: Port texture and velocity
Replies: 22
Views: 1453

Re: Port texture and velocity

... short sides need polished because the layer is fast. 2nd that. I'll leave a whole port carbide finished, but sand the turns. In fact, I just did that today on a near max effort pair of heads. Without sanding the turn they get turbulent, separate & flow backs up 8-10cfm at .750" lift, sand the t...
by BradH
Fri Nov 15, 2019 3:29 pm
Forum: Engine Tech
Topic: Anti reversion chambers on my 19 Charger 392
Replies: 11
Views: 667

Re: Anti reversion chambers on my 19 Charger 392

Pics of what the chamber looks like on the inside? Does it maintain a 3" ID, or does it neck down?
by BradH
Tue Nov 05, 2019 3:45 pm
Forum: Engine Tech
Topic: Senate Bill on Racing
Replies: 30
Views: 1863

Re: Senate Bill on Racing

Done (VA)
by BradH
Sat Nov 02, 2019 9:14 am
Forum: Engine Tech
Topic: Combustion chamber comparisons
Replies: 13
Views: 1178

Re: Combustion chamber comparisons

Misc comments... The big advantage to the Gen 1 heads was they came cast with more "ready to run" intake & exhaust bowl sizes. Along with the chamber redesign, Edelbrock cast the Gen 2 bowls far smaller and lost a solid 20-25 CFM. Not hearing much debate about the Gen 2 chamber being the better desi...
by BradH
Fri Nov 01, 2019 6:24 am
Forum: Engine Tech
Topic: Combustion chamber comparisons
Replies: 13
Views: 1178

Re: Combustion chamber comparisons

Chapman 260 with 2.18 intake is listed as 78 cc
Victor Gen1 are listed as 75 cc
Gen2... 72 cc

Mine have both the additional chamber work & have been milled .030; I measured one at 72.8 cc.
by BradH
Thu Oct 31, 2019 10:21 am
Forum: Engine Tech
Topic: Combustion chamber comparisons
Replies: 13
Views: 1178

Re: Combustion chamber comparisons

mag2555 wrote:
Thu Oct 31, 2019 6:15 am
As in a bit of a heart shape to bring the plug closer to the center of the chamber which will by nature make the chamber more bowl shaped.
Almost sounds like you're describing the old Chapman Stage VI head's chamber:
by BradH
Wed Oct 30, 2019 2:28 pm
Forum: Engine Tech
Topic: Combustion chamber comparisons
Replies: 13
Views: 1178

Re: Combustion chamber comparisons

mag2555 wrote:
Wed Oct 30, 2019 12:30 pm
I would love to see the gen 1 on the dyno with a rework of the chamber moved a little more deeper into the chamber...
As in sinking the valves to create more of a bowl around them from which to transition into the flatter area of the chamber?
by BradH
Wed Oct 30, 2019 8:53 am
Forum: Engine Tech
Topic: Switching from 45 to 50 deg seats - done some testing
Replies: 44
Views: 3281

Re: Switching from 45 to 50 deg seats - done some testing

KnightEngines wrote:
Tue Oct 29, 2019 9:43 pm
Yeah, I had an aggressive 45 seat in there that behaves pretty close to a 50, 38/45/65/80 with a big throat. Gone to 45/50/65/85 with similar throat.
You've done reverse-flow testing w/ that 45* seat config vs a "less aggressive" 45* seat config? If so, anything you could post? Thanks - Brad
by BradH
Wed Oct 30, 2019 8:45 am
Forum: Engine Tech
Topic: Combustion chamber comparisons
Replies: 13
Views: 1178

Combustion chamber comparisons

Pics or original Edelbrock BBM Victor chambers ("Gen 1") vs pics of more compact later style ("Gen 2") vs "Gen 2" that's been reworked to reduce valve shrouding, etc. The "Gen 1" chamber always looked odd to me, probably because the transition from the valve seats into the chamber didn't appear to o...
by BradH
Wed Oct 30, 2019 8:32 am
Forum: Engine Tech
Topic: Shop with profilometer in the DC Metro/VA/MD/WV/DE area
Replies: 9
Views: 579

Re: Shop with profilometer in the DC Metro/VA/MD/WV/DE area

I'd call this place first. They have some nice equipment, including a Kodak optical comparator so I would assume they had a profilometer. Never hurts to call and ask. http://www.profilemachineworks.com/ Interesting... they're about a 45-minute drive south of me, although I don't see myself needing ...
by BradH
Mon Oct 14, 2019 11:40 am
Forum: Race Cars & Parts - For Sale or Wanted
Topic: Holley/QFT hybrid 1.58"v AN 4150
Replies: 1
Views: 164

Holley/QFT hybrid 1.58"v AN 4150

I went OCD buying/building carbs for my car and have decided to sell a couple: Holley/QFT hybrid 1.58"-venturi Annular 4150 - QFT/Proform 1.58"-venturi "1050" main body - QFT billet 12-hole x .600"-ID billet annular boosters - Holley Ultra H/XP billet 5-emulsion metering blocks - BLP Pro Flow billet...