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Search found 533 matches

by rebelrouser
Thu Aug 05, 2021 9:18 am
Forum: Engine Tech
Topic: Pump shot tip-in AF mixture
Replies: 3
Views: 104

Re: Pump shot tip-in AF mixture

I am not sure using a wideband 02 is a good way to tune a accelerator pump shot. First the pump shot fuel is not atomized like fuel from the boosters, and is of short duration, not sure if the 02 will react fast enough to give an accurate reading. I simply tune for best 60 foot. My experience is tha...
by rebelrouser
Thu Aug 05, 2021 9:10 am
Forum: Engine Tech
Topic: 2004 chrysler 2.7 "sludging"
Replies: 5
Views: 324

Re: 2004 chrysler 2.7 "sludging"

If you don't use the right oil, and keep it changed yes the 2.7 will sludge and self destruct. Use only oil that meets Chrysler MS-6395 standard. You might be surprised that many of the popular name brand oils do not meet this standard. http://www.kmn-lubricants.com/wp-content/uploads/2015/10/201354...
by rebelrouser
Fri Jul 30, 2021 9:45 am
Forum: Engine Tech
Topic: Carter AFB maxwedge carb issues
Replies: 10
Views: 479

Re: Carter AFB maxwedge carb issues

In Carter nomenclature, the hole in the top is the idle bleed; the one in the side is the idle by-pass air bleed. Behind the BPAB, is the Economizer jet which controls air+fuel delivered to the transfer slot. So if you want a little more fuel at idle, would you need to reduce both the idle air blee...
by rebelrouser
Thu Jul 29, 2021 12:39 pm
Forum: Engine Tech
Topic: Carter AFB maxwedge carb issues
Replies: 10
Views: 479

Carter AFB maxwedge carb issues

I screwed this one up. Built an engine for a 64 Plymouth NSS car, engine ran good made 700HP on the dyno, and it ran 10.16 last weekend several times, all steel 3,500lb car. In working on the tune on the dyno, it did not want to idle right. In the past on the Edelbrock Carbs, I have drilled and tapp...
by rebelrouser
Wed Jul 28, 2021 12:59 pm
Forum: Engine Tech
Topic: 1969 440 chrysler rear main seal
Replies: 7
Views: 334

Re: 1969 440 chrysler rear main seal

does it have a stud girdle on it? Some of those need material removed so the oil can run back to the pan. The good ones have a oil return slot machined in them, the cheap ones don't. I seldom have trouble with the standard replacement rubber rear main seals. some of the OEM seal retainers have sharp...
by rebelrouser
Tue Jul 27, 2021 5:26 pm
Forum: Engine Tech
Topic: Principles of exhaust design!
Replies: 4
Views: 386

Re: Principles of exhaust design!

I am not an expert, just built a few sets of headers. Mainly because I want to be able to change spark plugs and the starter with out pulling the engine half way out, so I built my own. Not getting into physics, but buy a copy of pipemax, and let that software do the work for you. I usually start wi...
by rebelrouser
Mon Jul 26, 2021 10:19 am
Forum: Engine Tech
Topic: Non-adjustable valvetrain w/mild performance cam?
Replies: 4
Views: 335

Re: Non-adjustable valvetrain w/mild performance cam?

No problem using stock valve train with mild camshafts, except you still have to check that the lifter is preloaded properly, even if the engine has a non adjustable valvetrain. I have seen some of the cheaper mild camshafts, that to get the lift and duration they wanted they reduced the base circle...
by rebelrouser
Mon Jul 26, 2021 10:14 am
Forum: Engine Tech
Topic: what sealant to use on expansion plugs, cam tunnel plug etc
Replies: 15
Views: 828

Re: what sealant to use on expansion plugs, cam tunnel plug etc

As a n automotive instructor, we had several guest speakers for the students, one of them was a rep from the permatex company, he did a super presentation explaining the right way to use all their products, gave the students free sample for their toolboxes. And for freeze plugs he promoted using the...
by rebelrouser
Thu Jul 22, 2021 8:39 am
Forum: Engine Tech
Topic: Any distributor machine users here?
Replies: 32
Views: 8379

Re: Any distributor machine users here?

I taught automotive at a college for many years, we had a lot of different scopes. The easist scope to learn and use for the students was a Pico, it uses a computer. It is a high quality tool. Some of the cheaper scope PC type tools are junk so be careful what you buy. https://www.picoauto.com/produ...
by rebelrouser
Tue Jul 20, 2021 12:24 pm
Forum: Engine Tech
Topic: Blaster Cabinet Help
Replies: 28
Views: 920

Re: Blaster Cabinet Help

I taught at a technical college for 26 years, and we had three blast cabinets, one was snap-on, one was an off brand I don't remember. I purchased one like this and it was the best of the three. Just from my experience all blast cabinets are high maintenance equipment, so replacement parts are a mus...
by rebelrouser
Mon Jul 19, 2021 10:03 pm
Forum: Engine Tech
Topic: chain auto parts stores vs internet sellers
Replies: 32
Views: 1240

Re: chain auto parts stores vs internet sellers

I buy a balance of stuff from the internet and local parts stores. As posted many times the local parts stores get the small things I need, and the last minute stuff. But when you buy from the internet, many times you are helping small American owned businesses. Which may not be local, but they are ...
by rebelrouser
Thu Jul 15, 2021 9:15 pm
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2278

Re: Pontiac 400 heads

Do not follow others misguided advice to convert the intakes over to a 45 degree seat unless your planing on running over .550” lift and a big duration roller Cam to hold the valves open longer , and especially not if you are only interested in doing some minor clean up work in the ports and your u...
by rebelrouser
Thu Jul 15, 2021 9:12 pm
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2278

Re: Pontiac 400 heads

If you start with new valves, you can grind a 40 degree intake seat angle on them without running out of margin. On the stock heads I flow tested years ago, the intake port did not flow much more than the exhaust port. You will break into water in the short turn corners before you get decent flow f...
by rebelrouser
Thu Jul 15, 2021 8:38 am
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2278

Re: Pontiac 400 heads

Thanks a lot that was a great article. It would be best to buy a copy of the book, but being out of print it is really expensive. and it looks like they did use a 15 degree back on the intake valves.
by rebelrouser
Wed Jul 14, 2021 10:13 pm
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2278

Pontiac 400 heads

Helping a guy out with a 400 Pontiac for a 1969 GTO, street car. doing the heads and installed hard seats, going to do some minor porting work. Any Pontiac Guru advice? The intake valves are 30 degree, does back cutting the intake valve to say 15 degrees help?