300 Propane Recipe

[Anonymous]

Hi.....Bob here. I'm a newbei to this site, so please bear with me. I live on Vancouver Island, a beautiful place.

I just bought an 81 F150 from a kid, in great shape, straight and no rust. this is to replace my 82 F150 with 300,000K+ on it. My 82 was Propane powered (LPG) and I will swap that system over to my new truck.

I hear tell that the folk "Down Under" realy know how to handle propane, so I would like to put the question out.....What is the recipe for a good propane engine??? I am seeking m/pg (l/km). The 300 in my new truck is tight and has recently had the head done. The young fella I bought it from put a nice Headman 6-2 header on it. If anybody has a recipe for compression ratio, cam profile, induction system I would love to hear about it and perhaps help take things one step further.

Great site.

Thanks,

Bob

 

[xctasy]

I only talk Liquid Propane Dedicated, not a dual fuel engine. If you want dual fuel, get a CA 300 348 CFM carb, and a 2-bbl 2150 Motorcraft carb off a 302 1975- 1978 Granada, plus the 2-bbl Offy or Clifford intake. There is no other option, in my opinion.

The best economy option is the CA 125 Impco carb (rated at 202 cfm), L-series Impco converter, and VFF 30 line -lock-off with brass line of not less than 5/16" (7.94 mm) back to the tank.

Max power is limited to about 126 hp with this combo.

If you want to heat it up, go for a 2-bbl Offy or Clifford intake, get a CA 300 348 cfm carb. Then get a good cam no more than 265 degress total duration at lash, with less than 210 degrees duration at 50 thou lift.

I have an adaptor I made for my Falcon XE. It really works.

http://www.kastang.net/fsp/xecute.html<<<<See it here!

 

[wagon]

Gas Research Australia make a 'proper' jettable gas carb that (from my experience with some impco stuff, from my taxi driving days) is the best.....

 

[xctasy]

There is no doubt in my mind that the Gas research stuff is better. The converter is more sensitive, it doesn't need a hi-stall converter to full vacuum into the air valve, and its also got very good support...in Australia.

Oh, and the rack'n'pinion and throttle action is light years ahead of Impco.

When is the Canadian GRA agency going to start up?

Impco is cheaper, and there is much more info for those in the Americas. The other thing is that when you go over 250 cubes, the Impco's poor part throttle fuel economy improves a good deal. On a smaller 3.3, 3.9, 4.0 or 4.1, the GRA has a better fuel delivery curve because of the fine vacuum Century-style converter.