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Search found 2379 matches

by Alan Roehrich
Fri Jul 05, 2019 10:53 am
Forum: Engine Tech
Topic: Fuel Atomization by a Carb
Replies: 21
Views: 1103

Re: Fuel Atomization by a Carb

Not sure what you're seeing is really related to atomization. Most applications for annular discharge venturis are to increase throttle response on applications where the carburetor size has a negative effect on throttle response at lower RPM. The annular discharge increases the signal, pulling more...
by Alan Roehrich
Fri Jul 05, 2019 10:46 am
Forum: Engine Tech
Topic: Ring Seal
Replies: 71
Views: 3258

Re: Ring Seal

I have never had Keith or Kevin tell me to install rings dry, ever. I do use Kwik Seat. I usually use Dexron, although sparingly, I lube the rings and grooves lightly, place a drop or two on the skirts, and the cylinders are already wiped with a lint free cloth saturated with Dexron and wiped dry. I...
by Alan Roehrich
Thu Apr 04, 2019 7:49 pm
Forum: Engine Tech
Topic: ? who takes in distributor work; has SUN dist machine/tester ?
Replies: 10
Views: 663

Re: ? who takes in distributor work; has SUN dist machine/tester ?

Jimmy Bridges, Bridges Performance, in Nashville TN, phone 615-228-3516. He has 60 years of experience. Tell him that I sent you.
by Alan Roehrich
Thu Apr 04, 2019 7:45 pm
Forum: Engine Tech
Topic: Decking a 496 Block
Replies: 4
Views: 652

Re: Decking a 496 Block

If the pistons are shelf stock and you haven't scratched them, see if you can send them back, and just order a custom set, they won't be much higher. Also, send the block to a competent machine shop and have the decks corrected. And everything else checked.
by Alan Roehrich
Sun Mar 31, 2019 12:23 pm
Forum: Chassis / Suspension / Body
Topic: drag race wheel alignment
Replies: 12
Views: 1512

Re: drag race wheel alignment

We run tall ball joints to cut down on camber change, and bump steer kits. As a rule, we run 1/8" to 1/16" toe in, and as much positive caster as possible of course, not using longer bolts or studs, or stupid amounts of shim). We align with the car raised in front around 2"-3" from ride height, with...
by Alan Roehrich
Sat Mar 16, 2019 10:20 am
Forum: Engine Tech
Topic: Cloyes Quick-a-just
Replies: 20
Views: 1334

Re: Cloyes Quick-a-just

We use the fast adjust type timing set with the six bolts on the cam gear exclusively, and extensively, where chain type sets are used on race engines. We've had zero problems and zero failures. The max open pressure we've used them with is around 600#. For hard core racing roller applications, we u...
by Alan Roehrich
Wed Mar 06, 2019 9:10 am
Forum: Engine Tech
Topic: Let's discuss GM's new RUMORED Big Block reintroduction!
Replies: 88
Views: 6202

Re: Let's discuss GM's new RUMORED Big Block reintroduction!

You're not going to end up with an aluminum block. The same basic engine is going to be in trucks from the regular 1 ton up to Class 7. It's probably going to be compacted graphite cast iron. You might save 100# or so with aluminum. But you have to make it really strong to run constantly at WOT and ...
by Alan Roehrich
Tue Mar 05, 2019 11:20 pm
Forum: Engine Tech
Topic: Let's discuss GM's new RUMORED Big Block reintroduction!
Replies: 88
Views: 6202

Re: Let's discuss GM's new RUMORED Big Block reintroduction!

Had someone email me and ask me to clarify my points, and check out what was posted elsewhere. That Mark Smyth guy is a real piece of work. Just, wow. The 8.0 he speaks of is an old Mark IV/V/VI type engine, basically a 4.27"x4.25" Mark VI big block with old Mark IV style oval port heads, possibly w...
by Alan Roehrich
Tue Mar 05, 2019 7:39 pm
Forum: Engine Tech
Topic: Let's discuss GM's new RUMORED Big Block reintroduction!
Replies: 88
Views: 6202

Re: Let's discuss GM's new RUMORED Big Block reintroduction!

Anything 8.0L with a cast iron block and aluminum heads is going to weigh about the same. Everyone, or damned near everyone, makes a 1 ton and bigger truck engine with a cast iron block for several very good reasons. Even the new "big LS" small block for the 3500 uses a cast iron block, according to...
by Alan Roehrich
Tue Mar 05, 2019 4:01 pm
Forum: Engine Tech
Topic: Let's discuss GM's new RUMORED Big Block reintroduction!
Replies: 88
Views: 6202

Re: Let's discuss GM's new RUMORED Big Block reintroduction!

I don't know anyone who has tried to put the 8.1 crank in the 7.4 block. I don't know why you would. It's not like it is a special piece, and once you get past 4.25" stroke, most move to a 10.2" deck height block. GM sold much of the tooling and equipment for all of the production big block Chevy en...
by Alan Roehrich
Tue Mar 05, 2019 2:19 pm
Forum: Engine Tech
Topic: Let's discuss GM's new RUMORED Big Block reintroduction!
Replies: 88
Views: 6202

Re: Let's discuss GM's new RUMORED Big Block reintroduction!

Interesting that GM had developed an 8.0L, (in 2010), that seems to be a tall deck version of the 7400, even the port layout is same. Perhaps a revised version of this, with yet again with more stroke !? (4.27" X 4.25" @ 8.0L ) The rumor/speculation in the above links is 8.8L. The 8.1L Vortec IS a ...
by Alan Roehrich
Sun Mar 03, 2019 2:28 pm
Forum: Engine Tech
Topic: Let's discuss GM's new RUMORED Big Block reintroduction!
Replies: 88
Views: 6202

Re: Let's discuss GM's new RUMORED Big Block reintroduction!

GM actually did sell the production Chevy big block tooling. There's a company that produces them for industrial uses, and sells spare parts, it is not Mercury Marine. Yes, there is a trend toward smaller engines. But NOT in one ton and medium duty trucks. Ford is not introducing a 7.0 liter pushrod...
by Alan Roehrich
Sun Mar 03, 2019 10:43 am
Forum: Engine Tech
Topic: BBC weak points
Replies: 21
Views: 1504

Re: BBC weak points

Walter, do a search in the 8.1L intake, you'll find people modify it, there are a ton of pics. There's a guy who will modify it for you for $800, which is probably cheaper than you could do the full Dart deal. I doubt the Dart would do anything for fuel economy. He'd probably get a lot more out of a...
by Alan Roehrich
Sat Mar 02, 2019 10:43 pm
Forum: Engine Tech
Topic: BBC weak points
Replies: 21
Views: 1504

Re: BBC weak points

In some 40 years, I can count on the fingers of one hand the times that I've seen the roll pin or distributor gear fail on its own. Of course, there are situations where people have jacked up pressure or volume, or both, and worn out the gear. It's not ideal, but it's not terrible, either. It's plen...
by Alan Roehrich
Sat Mar 02, 2019 2:40 pm
Forum: Engine Tech
Topic: BBC weak points
Replies: 21
Views: 1504

Re: BBC weak points

As to the original post, what is wrong with the big block as a TRUCK engine for TRUCKS with a GVWR of 10,000 pounds or more, needing instant torque at as low an RPM as feasible, and maximum power at no more than 5500 RPM? Actually, not much. The crank case on even the old Mark IV is wide enough to c...