Search found 13 matches

by burbfixer
Sun Feb 18, 2018 12:11 pm
Forum: Propane Forum
Topic: Whats wrong with this turbo setup?
Replies: 5
Views: 68

Re: Whats wrong with this turbo setup?

dayzed, This sounds like a great project! Propane + boost is a great combo and you will no doubt be pleased with the results. And I agree with gottago, you've asked good questions. +1 on the idea of starting with a single mixer/converter setup and seeing where you are at. I doubt you will be disappo...
by burbfixer
Tue Feb 13, 2018 1:22 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

Hmm. I think I didn't explain my theory very well. I understand velocity is important, and going to a very large port isn't the best idea for a street driver, no matter what fuel is used. What I meant was maybe a bit more volume in the port might be a good thing to allow 'room' for a mixture that si...
by burbfixer
Sun Feb 11, 2018 9:49 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

Here's something I've wondered about, and it relates to what we've been discussing. Propane vapor occupies a greater volume of the intake charge. It was awhile back that I researched this, but I never did find a definite answer to exactly how much more, but compared to gasoline 'mist' from a carbure...
by burbfixer
Mon Jan 22, 2018 1:22 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

Hey gents... Been tied up with life, and then this website seemed to be down too so I haven't on for a while... storm, I was re-reading your Dec 24 post. You made an interesting comment pertaining to port velocity : "a small head vs a slightly larger head will not make much difference if air speed r...
by burbfixer
Mon Dec 25, 2017 1:44 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

One challenge with the L29 Vortec 454 heads is getting the compression up to the 11:1 range we've been discussing. The engine is rated supposedly 9:1 stock, and some gains could be made with milling/gaskets, but I doubt it would be anywhere near that much. The shape of the chamber will interfere wit...
by burbfixer
Sun Dec 24, 2017 11:21 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

Wow, great discussion everyone! I just complicated the hell out of my plans tho. Strolled thru my nearest Pick n Pull recently and (holy crap!) found a 212km '97 Vortec 454. I'd never seen any brand big block in that yard before, but I was back the minute they opened the next day to pull it! So now ...
by burbfixer
Tue Dec 12, 2017 2:15 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

The experimenting you and your friends have done has confirmed some of what I've learned from 30+ years of propane experience. AND completely blown some of it out of the water! Good for you! I don't think I've ever heard of that combination of economy/performance in a V8 propane street vehicle, so y...
by burbfixer
Thu Dec 07, 2017 1:12 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

Oh, no worries at all, you've been awesome! I thought the impression I'd given was kinda funny, that's all. Thought I should clarify. Nowadays, I tend to drive with awareness of the "fusible links' in the stock drivetrain. With my 77 Stepside, the supercharged 396 & 44" tires tested things to the li...
by burbfixer
Sun Dec 03, 2017 2:30 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

First off, Still totally appreciate the input from all of you, and it's kinda cool to be hearing things from one guy who must live within 2 or 3 hours from me, another who's down in Australia, and another from Netherlands. Gotta love the internet for that! BigBlockMopar, It sounds like there are sev...
by burbfixer
Tue Nov 21, 2017 12:29 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

Wow, thank-you guys for being interested enough to continue discussing this! storm, My apologies for the confusion earlier. I had the thread going over on Speedtalk and some here were posting on it, so I kinda picked up the conversation from there, but once cam entered into it, you might have been l...
by burbfixer
Sat Nov 18, 2017 12:52 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

You both make valid points, and the input is appreciated. For my purposes, a shorter cam with high 10's or 11:1 compression sounds like the way to go, you two arent that far apart on your opinions there. Since fuel efficiency at very low cruise rpm is a desired result, I wonder if going bigger with ...
by burbfixer
Sun Nov 12, 2017 10:37 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

Re: 454 efficiency - Maximum CR

storm, Thanks for the info, sounds like you know your stuff! Anyone else care to chime in on the maximum CR you've used sucessfullly? gottago Thought you might find this! Super-appreciate your input on the other site. I had actually forgotten about this site, but there seemed to be a bit of activity...
by burbfixer
Fri Nov 10, 2017 1:34 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1217

454 efficiency - Maximum CR

Hey everyone. First post to this sight. My question pertains to a safe maximum CR for a propane engine build. I understand that cam choice factors in heavily. No doubt other things have a bearing too, such as quench. I built, and drove for several years, a 396 that had 10.25 cr, and a short 204/216 ...