Don Terrill’s Speed-Talk

While I understand the function of the IAB and have worked on it tuning my Barry Grant, a fellow car guy has asked a question that I can't say I know how to answer. Or even what's being asked. Quoted: AED 950HO on ZZ502. Tuning the transition slot running a bit rich at cruise. The options are reduc...

Do you a pic of metering block on carb now

What size emulsion? 31"× 2

This old block is ready for new IFR’s. I really do think my factory block is defective. 20201003_172229.jpg 20201003_175257.jpg 20201003_175310.jpg 20201003_182220.jpg I started using the pink gasket a few years ago when I started moving the IFR to the lower position. You say you are going to try a...

20201003_171930.jpg 20201024_042129.jpg I like to do transfer jet in main body modification, I think there is to much slot area in most holley style carbs which leads to excessive fuel enrichment at low engine speed/ throttle position. My take on air bleeds are the bigger jet allows more air in ear...

Well, I did what tuner said. Cleaned up the secondary valve edges and closed them tight. Closed off the secondary idle mixture screws and ran off the front ones. The engine did not like it. Gave me a stumble at secondary opening onset. Ran very weird. For giggles, I did the usual. I opened them the...

Not that it means much but here is numbers by AFR,comparing flow numbers is not a great idea but they are not inflated by AFR. my opinion is they have not achieved anything, they bolt another set of heads on the engine and it runs the same, WOW . I have done that test more than once with same result...

I forgot to mention I have talked to guys over last couple of years at the track who have changed rear gear ratio with no other changes and expected ET improvements. All have said the only thing that happened was rpm increases with no ET gain. My opinion is gear/ tyre diameter go hand in hand and al...

I am a fan of the slide rule,it is something to work towards. With my own combos it is usually 15hp or so relevant. As been discussed previously if you are not using the potential power of the engine work on the rest of the car and leave engine alone. This is another chart worth looking at 20220815...

rebelyell wrote: ↑Mon Apr 22, 2024 9:59 am that said, seems speedmaster79 website remains up.
just the same, no thank you

Unfortunately people will keep buying there junk parts,I bet most of it comes through fleabay

I've seen the old Moroso slide rule has been mentioned here at Speed-Talk every now and then. I was kind of surprised at the amount of merit it gets from folks I wouldn't have thought put any faith into it. Opinions? FWIW, I went back and dug out some old time slips, chassis dyno results, engine bu...

Rich 3000 RPM cruise at 70 mph at 20 hg of vacuum with my Holley 750 Street HP 82750SA vacuum secondary. 13 AFR. Everything else is in range and clean. This is a 4150 with 4 corner idle. Downleg boosters. This per my AEM UEGO AFR gauge. The carb is set up as follows: Front curb idle at 3/4 turn. Tr...

Looking like you are extremely close to Larry calculated, very impressive.
Looking forward to some details, appreciate you sharing.

Slide rule says 9.95 @ 134 mph @ 3500 pds and 650 hp

As an Aussie i am ashamed of what this company doe's to small business owners and keeps doing. By now people should know what this company doe's........so stupid is what stupid doe's........if you buy speedmaster it's on you. Support small business like broader, because like he said he put's his he...