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Search found 424 matches

by rebelrouser
Sun Jan 17, 2021 12:52 am
Forum: Engine Tech
Topic: Holley sniper on engine dyno
Replies: 14
Views: 918

Re: Holley sniper on engine dyno

Just asking, how many EFI systems have you paid big bucks for and then a few years later were unsupported by the seller? Just buy our even-better-new-latest-and-greatest is their suggested solution. That's if they are even still in business and answering the phone. Holley has screwed us with severa...
by rebelrouser
Sat Jan 16, 2021 9:33 am
Forum: Engine Tech
Topic: Holley sniper on engine dyno
Replies: 14
Views: 918

Re: Holley sniper on engine dyno

What other EFI systems do you run on your dyno? Dominator, HP? Other? Do your O2's read fine on carbed or other EFI setups? What do the plugs "say" for the Sniper engines? You've run a bunch of Holley EFI stuff so you're familiar with enabling and disabling closed loop, yes? Since Snipers only read...
by rebelrouser
Fri Jan 15, 2021 4:29 pm
Forum: Engine Tech
Topic: 350 sbc reduce compression ratio or retard cam?
Replies: 33
Views: 739

Re: 350 sbc reduce compression ratio or retard cam?

Most of the issues people have with the KB hypers is not setting the ring gaps correctly My experience is the same, I have used KB pistons for a lot of builds. I ran a 440 mopar that went 10.90's in a 3,400 lb car that had KB pistons for 6 seasons, with no problems at all. One time I even built a 3...
by rebelrouser
Fri Jan 15, 2021 2:19 pm
Forum: Engine Tech
Topic: 350 sbc reduce compression ratio or retard cam?
Replies: 33
Views: 739

Re: 350 sbc reduce compression ratio or retard cam?

Also when they say retard the timing, most of the time just rotating the distributor is not what is called for. Simply retarding the distributor will make it a dog. Changing the advance curve is what is called for. Performance trends for example will calculate an advance curve on any engine combinat...
by rebelrouser
Thu Jan 14, 2021 9:07 am
Forum: Engine Tech
Topic: Holley 670...can't get rid of the massive lean spot
Replies: 10
Views: 400

Re: Holley 670...can't get rid of the massive lean spot

Messed with lots of Holleys, don't remember list numbers or models but generally a couple things I have done is, on the accelerator pump, you must remember the pump cam and nozzle size while they play a big part in how much enrichment you get, the most important thing is the spring rate on the pump ...
by rebelrouser
Wed Jan 13, 2021 7:13 pm
Forum: Engine Tech
Topic: Holley sniper on engine dyno
Replies: 14
Views: 918

Re: Holley sniper on engine dyno

How many guys out there have experience using a Holley sniper or sniper stealth on an engine dyno? I've been running my dyno for around 6 years now and average about 125 engines per year . I believe the dyno is very repeatable , but I'm finding when running engines with holley sniper kits the the e...
by rebelrouser
Mon Jan 11, 2021 6:53 pm
Forum: Engine Tech
Topic: polishing a crank
Replies: 16
Views: 943

Re: polishing a crank

If you are polishing by hand, using a shoe string, I use 400, then 600, then 1000 grit, the 1000 grit should be pulled the opposite direction of the other two grits. Then clean with soap and water, lightly oil, and clean with a rag until you get no dirt on an oily rag. I have a stand to spin cranks ...
by rebelrouser
Sun Jan 10, 2021 12:07 am
Forum: Engine Tech
Topic: 350 Chev vac. leak?
Replies: 10
Views: 244

Re: 350 Chev vac. leak?

That is the classic signs of a problem in the valvetrain, most likely a flat camshaft or broken valve spring. Any time a vacuum gauge needle bounces on a running engine it means something is wrong with the way the air is entering the engine, and the cylinder causing the problem makes the needle fall...
by rebelrouser
Fri Jan 08, 2021 11:54 am
Forum: Engine Tech
Topic: Piston Design Questions
Replies: 38
Views: 1008

Re: Piston Design Questions

just buy the crank and rods, not some supposed balanced kit that will need to be balanced again anyways. shop for the piston that works for your needs instead of compromising by buying some hack balanced kit. One other thing from my experience is that while they say you will have 11 to 1 compressio...
by rebelrouser
Fri Jan 08, 2021 10:53 am
Forum: Engine Tech
Topic: Piston Design Questions
Replies: 38
Views: 1008

Re: Piston Design Questions

If you are wanting to optimize the compression ratio, why stop at only looking at the pistons available? A die grinder and a graduated burette, will allow you to adjust as much as you need, I would think. Plus if you grind the chamber correctly, you will most certainly pick up some flow in the cylin...
by rebelrouser
Wed Jan 06, 2021 9:03 pm
Forum: Engine Tech
Topic: Advice on cam failure
Replies: 16
Views: 900

Re: Advice on cam failure

been rebuilding engines since 1974, only had one 6 cylinder camshaft break, it was a 240Z overhead camshaft and the cylinder head was warped and stressed the camshaft as soon as the engine warmed up. From the look of your pictures, your cam tunnel is not straight. I have a round bar used as a straig...
by rebelrouser
Mon Jan 04, 2021 11:20 pm
Forum: Engine Tech
Topic: Piston Pin Clips
Replies: 14
Views: 533

Re: Piston Pin Clips

A square clip CAN work in a round groove. The VW and hoduh racers are doing it, and it is apparently working. They are stupid enough to try things we would never think of and god bless them for it. But I think.... the round wire clip is a fine design and you just need figure out how to work it. WEL...
by rebelrouser
Mon Jan 04, 2021 1:52 pm
Forum: Engine Tech
Topic: Header design help request, mid-engine LT1 Corvair
Replies: 12
Views: 707

Re: Header design help request, mid-engine LT1 Corvair

Thumbs up for Pipemax software as well. built around 20 sets of headers over the years and helped several others. If angry corvair is an engineer, he should buy the software just to sit down and run it on his engine combination. His math abilities would help him understand it really quick I would th...
by rebelrouser
Sun Jan 03, 2021 5:26 pm
Forum: Engine Tech
Topic: maybe torque ain't so bad after all, IF .................
Replies: 13
Views: 833

Re: maybe torque ain't so bad after all, IF .................

I think some people get confused by the terms bolt torque, and clamping force. Any torque specification and procedure is designed to get equal clamping force on the components being held together. Then add in temperature changes and trying to clamp dissimilar metals. I started as a flat rate car Tec...
by rebelrouser
Thu Dec 31, 2020 12:20 pm
Forum: Engine Tech
Topic: Ignition , combustion statement
Replies: 12
Views: 666

Re: Ignition , combustion statement

I do not have an engineering background, just messed with engines and cars all my life, and do a little reading. One device that taught me a little about ignition systems was a old Champion spark plug tester. I worked in a shop that had one, and before fuel injection, the first big cold snap every y...