Search found 654 matches

by storm
Wed Jan 22, 2020 7:56 pm
Forum: Messages
Topic: Forum Logo
Replies: 13
Views: 4770

Re: Forum Logo

I see the forum format has also reverted back to middle screen instead of whole screen with this upgrade.
by storm
Tue Jan 14, 2020 7:12 pm
Forum: Propane Forum
Topic: Status on High Performance 4-barrel Carbs
Replies: 5
Views: 95

Re: Status on High Performance 4-barrel Carbs

and on top of that maybe in some part of the world there is a decrease in old car enthusiasts as generation X is not so much moved by old cars…. That's not really the case in Australia. it's the baby Boomers and Gen X (of which I am one) who are keeping the older cars going. In Australia Gen Y, and...
by storm
Mon Jan 13, 2020 6:43 pm
Forum: Propane Forum
Topic: Status on High Performance 4-barrel Carbs
Replies: 5
Views: 95

Re: Status on High Performance 4-barrel Carbs

Most owners of older cars are usually trying to remain as original as possible other then maybe some engine modifications. Installing a propane tank, vapourizer and mixer is beyond their plans of rebuilding an older vehicle. It adds significant costs, beyond appearance, for vehicles driven limited ...
by storm
Wed Jan 08, 2020 2:18 pm
Forum: Propane Forum
Topic: IMPCO 425 Improvement
Replies: 4
Views: 74

Re: IMPCO 425 Improvement

Hi Marc I will be building a flowbench,based on the PTS Flowbench Technology design, in the future where I will test my theories on carbs/mixers/throttle bodies/heads/manifold/etc etc etc but they are not cheap to build. The bench I want to build will cost me at least $2000AU (approx 1200 Euro) just...
by storm
Tue Jan 07, 2020 11:54 pm
Forum: Propane Forum
Topic: IMPCO 425 Improvement
Replies: 4
Views: 74

Re: IMPCO 425 Improvement

G'day mate, gotta love the SBC in the F body. I miss my old T/A with the Pontiac 400. But I digress. As far as I know there are 3 things that limit the amount of air that a 425 can flow at any given pressure drop. The 1st is the Holley baseplate, the 2nd is the air valve assembly, and the 3rd is the...
by storm
Wed Dec 11, 2019 3:19 am
Forum: Propane Forum
Topic: VPV tuning
Replies: 9
Views: 175

Re: VPV tuning

Make sure you have the VPV connected on the secondary side of the regulator/converter. If you have it connected to the primary side you will most definitely flood the engine. Take a look at the attached picture to see where the VPV should be connected. Impco-Vacuum-Power-Valve-Vpv-Boost-Lpg-Richen-_...
by storm
Tue Nov 05, 2019 3:12 am
Forum: Propane Forum
Topic: Intro: Another "obsolete" engine going propane.
Replies: 2
Views: 185

Re: Intro: Another "obsolete" engine going propane.

I like it when people keep old engines running with LPG, keep us posted with your progress.
by storm
Tue Nov 05, 2019 3:09 am
Forum: Propane Forum
Topic: Which Holley throttle body should I use?
Replies: 5
Views: 436

Re: Which Holley throttle body should I use?

I can't comment on the size of the throttle body based on experience. I'd love to test different TBs on a 425 to see if different ones make the 425 flow less than advertised or not. I think you can assume a TB that fits a Holley 600 cfm carb will be suitable and not restrict flow.
by storm
Thu Oct 24, 2019 3:29 am
Forum: Propane Forum
Topic: Which Holley throttle body should I use?
Replies: 5
Views: 436

Re: Which Holley throttle body should I use?

The best one to use is the mechanical secondary for the squarebore carb.
You can use a vacuum secondary but you will loose 2 barrels if you do because the secondaries won't open effectively.
by storm
Thu Sep 26, 2019 4:14 am
Forum: Propane Forum
Topic: Help to identify the parts in this picture.
Replies: 12
Views: 775

Re: Help to identify the parts in this picture.

Absolutely brilliant mate, the pictures help show exactly what I am looking to find out. I'm going to try and get some of them for my Troopcarrier.
Thanks again, cheers.
by storm
Sat Sep 21, 2019 3:09 pm
Forum: Propane Forum
Topic: Help to identify the parts in this picture.
Replies: 12
Views: 775

Re: Help to identify the parts in this picture.

You are a champ BBM, thank you very much.
by storm
Fri Sep 20, 2019 7:59 pm
Forum: Propane Forum
Topic: Help to identify the parts in this picture.
Replies: 12
Views: 775

Re: Help to identify the parts in this picture.

Thanks for that.

Are you able to find out the size of the internal orifice?
by storm
Thu Sep 19, 2019 3:06 pm
Forum: Propane Forum
Topic: Help to identify the parts in this picture.
Replies: 12
Views: 775

Re: Help to identify the parts in this picture.

Thanks BBM
I looked through the info I have and couldn't find them, maybe they aren't available over here. They are certainly available online through ebay seller (mainly Poland).
What size fittings does it take?
by storm
Sun Sep 15, 2019 12:11 am
Forum: Propane Forum
Topic: Holley 600 Base Plate for Impco 425
Replies: 2
Views: 342

Re: Holley 600 Base Plate for Impco 425

You don't, or shouldn't, need to block any ports. But you do need to block the hole that is smack bang on the middle of the baseplate between the 4 throttle blades. A Holley baseplate gasket will seal everything else.
by storm
Sat Sep 14, 2019 3:29 am
Forum: Propane Forum
Topic: Help to identify the parts in this picture.
Replies: 12
Views: 775

Re: Help to identify the parts in this picture.

Thanks Tom, I'll do some more research and see if I can find a part number.