Search found 684 matches

by storm
Sun Mar 29, 2020 7:48 pm
Forum: Your Project
Topic: Australian L67 build
Replies: 7
Views: 652

Re: Australian L67 build

Here's a picture of what we call a spud. This particular one is for a Holden V6-V8 (they use very similar throttle bodies).
spud-ring.jpeg
spud-ring.jpeg (9.83 KiB) Viewed 10 times
by storm
Sat Mar 28, 2020 9:34 pm
Forum: Your Project
Topic: Australian L67 build
Replies: 7
Views: 652

Re: Australian L67 build

The M90 is capable of working with a "vacuum" restriction the trick is to have the restriction open as quickly as possible. As soon as you have a regular efi throttle body you have a vacuum restriction on front of the blower. My ideal setup would be 2 GRA throttle bodies, but their isn't alot of roo...
by storm
Fri Mar 27, 2020 12:31 am
Forum: Your Project
Topic: Australian L67 build
Replies: 7
Views: 652

Re: Australian L67 build

Today is the 1st day I have been able to go out due to self isolating because I have/had a head cold and can't afford to come into contact with anyone that has Covid-19. With regards to Covid-19 there are at least 9 cases in my local medical district. Anyway I went out and got some bolts so I can mo...
by storm
Wed Mar 25, 2020 10:51 pm
Forum: Propane Forum
Topic: Lean out at WOT. Fine at 3/4 throttle
Replies: 13
Views: 85

Re: Lean out at WOT. Fine at 3/4 throttle

Sorry to say this but if you go by the HP & TQ outputs shown in this post in your other thread you probably are at the limits of both units. If you take a 1/3 driveline loss your engine is making close to 350 HP at 4500 RPM and that is way past the advertised capability of a 425 which is rated at ap...
by storm
Mon Mar 23, 2020 11:25 pm
Forum: Your Project
Topic: Australian L67 build
Replies: 7
Views: 652

Re: Australian L67 build

Updated 2nd post with pics, thanks Frank for your help.
by storm
Mon Mar 23, 2020 2:56 pm
Forum: Propane Forum
Topic: Propane Tuning AFR and Lamda
Replies: 5
Views: 82

Re: Propane Tuning AFR and Lamda

How do you know that you have exceeded the airflow ability of the Impco 425? As RPM gets higher does the AFR start going lean around 6000rpm on a 350 sbc? You'll get alot of different answers to both the questions depending on who answers them. 1. I run a vacuum gauge once you see the vacuum rising...
by storm
Sat Mar 21, 2020 10:03 pm
Forum: Propane Forum
Topic: Propane Tuning AFR and Lamda
Replies: 5
Views: 82

Re: Propane Tuning AFR and Lamda

Most O2 sensors and loggers are setup to tune in the petrol AFR scale regardless of the fuel. I, personally, tune in Lambda so that when people see me tune they don't get confused. With regards to richening up and then adding boost it isn't what I would do but I'm not a turbo expert and others who a...
by storm
Sat Mar 21, 2020 8:21 pm
Forum: Your Project
Topic: Australian L67 build
Replies: 7
Views: 652

Re: Australian L67 build

A week has past and I have only just had a chance to try to work on the L67. I haven't got any bolts long enough to put it on my engine stand. So I have taken some photos of it and will try to get into town one day this week to get some mounting bolts. IMG_20200322_104428.jpg IMG_20200322_104221.jpg...
by storm
Sat Mar 21, 2020 3:01 pm
Forum: Propane Forum
Topic: L67 LPG options?
Replies: 2
Views: 72

Re: L67 LPG options?

6-2-06 010_1.jpg
I was thinking along the line of a horizontal mount that slips into pre-existing intake piping. Like the 225 in the attached picture.
by storm
Sat Mar 21, 2020 2:26 am
Forum: Propane Forum
Topic: L67 LPG options?
Replies: 2
Views: 72

L67 LPG options?

Ok here's a curly one for you all. I'm starting to build an L67 (supercharged 3.8 litre V6) and am thinking about my LPG options. In the long term the engine will get LPG injection (hopefully liquid but even vapour is better than nothing) but in the short term I will stick with a mixer system of som...
by storm
Mon Mar 16, 2020 4:21 am
Forum: Propane Forum
Topic: mkiv 454 big block and impco300 mixer too small?
Replies: 7
Views: 479

Re: mkiv 454 big block and impco300 mixer too small?

My old Trans Am with the Pontiac 400 had a 750 cfm Quadrajet on it, 455 engines had 800 cfm units. My 308 Holden has an 800 cfm unit on it. The Pontiac 455 SD had an 800 cfm unit on it. Not one of these engines "needs" 800 cfm nor do any of them use the full 800 cfm on performance street trim. I hav...
by storm
Sun Mar 15, 2020 12:16 am
Forum: Your Project
Topic: Australian L67 build
Replies: 7
Views: 652

Australian L67 build

I finally got hold of an L67, or what has been sold as an L67, and can start the work to convert my plain Jane VS wagon to a street sleeper. The engine come with a VS LIM (I was really pleased with this), a VT PCM with a memcal in it (don't know what it is yet though), an ebay special VT XU6 memcal,...
by storm
Thu Mar 12, 2020 3:03 pm
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4261

Re: Dual carbs with propane?

Everyone seems to have a different reason for my dirty valves. Im inclined to believe its from cylinder blowby, my machinist thinks its the valve seals (whitch I replaced twice), Tom68 says it my came from my cam, and C3H8 claims its inherent to this engine. Im not sure what the truth is. C3H8 is a...
by storm
Wed Mar 11, 2020 7:43 pm
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4261

Re: Dual carbs with propane?

Wouldnt the cam-induced-egr theory only work with a horribly restricted exhaust? Any sort of free-flowing exhaust system should provide enough of a reduction of pumping losses to offset any mileage benefit of egr Just like "variable compression ratios" due to cam duration and overlap theory the "ca...
by storm
Wed Mar 11, 2020 1:46 am
Forum: Propane Forum
Topic: Dual carbs with propane?
Replies: 25
Views: 4261

Re: Dual carbs with propane?

The PCV always left a layer of oil in my intake. I thought that the catch can would help keep the intake valves clean. That's just an indication of an engine that is wearing or has to much clearance. Catch cans are a great idea but many people get a cheap unit that is to small for the engine. I tho...