Oil Light and Brakes, Pics of LPG Adaptor

D

Danielson

Well-known member
Hi My oil light is coming when braking, XW with 221 motor should I be concerned ?

I have also atattched some pics of my LPG adaptor to convert a Impco 300A to a weber throttle body onto a log head. First an adaptor was made to fit a weber carb which I ran for a while. The studs were removed for the lpg conversion. 2 weber throttle bodies were used and the top one was gutted and filled all holes with devcon and was then then matched to the custom LPG adaptor. The black silicon is to seal over the top of 4 couterunk 8mm bolts that holt it all together. The bolt heads are directly under the sealing surface of the convertor. It works great. Hope this helps anyone wanting to do it this way.
Cheers Dan


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Style! Quite well done there mate.
May have to chuck up some pictures of my holley 350 to single point injection manifold adaptor once it's finished. Had to raise the height of the carb to clear the shock tower :S
 
Not bad at all, there are so many ways to do straight LPG conversions hey? I did mine about a year ago. I made around 100rwkw on petrol and after switching to dedicated LPG, it felt like I picked up a good 10rwkw. How does your car feel now? I was thinking too, if you needed more flow out of it, you could bore the throttle bores out to say 500 holley size, fill up the holes in the casting, put larger butterflies on and have even more power.
 
The 300 A is a gem, and on the right Ford Six, it runs very well. It's rated at 348 or 432 cfm at 2"Hg pressure drop. The Stock petrol ADM 34 carb is rated at about 320 to 336 cfm at 3"Hg. When you run just the throttle body, the flow rate increases 35%. Unlike the stock gasoline carbs, a throttle body has no venturis, so this is how you are getting 35% more carb size anyway.


I used a 500 cfm #4412 carb throttle body (Holley) and 300A, and that air cleaner on my XE Falcon 4.1. The results were nothing short of stunning. The Impco carb is really a bit large...it's hard to set the idle, and it can be hard to set the C0 at wide open throttle. It's all made up for in that it bolts right on to a Weber 34 ADM/ADF or Holley throttle body, and that is the portal to power. It can yield 216 hp as an A1 variant, and 270 hp as an A5

Basically, you don't need to go any bigger than the stock ADM throttle body.

The stock hole for a early Falcon log head is 1.3", and its 1.5" by 1968, and about 1.75" after 1971, so anyhting bigger than the stock Weber 34 carb is really too big anyway!
 
The stock hole for a early Falcon log head is 1.3", and its 1.5" by 1968, and about 1.75" after 1971, so anyhting bigger than the stock Weber 34 carb is really too big anyway!
Click to expand...

I would agree with that on a stock sized intake hole, but what about when I go and enlarge that to a bit over 2" and modify the rest of the motor? From memory a 250 inline six at 6000rpm with a volumetric efficiency of 85% should require about 370cfm of air/fuel mix. What size log intake/throttle plate/intake opening would be big enough as not to cause too large a restriction for that?
 
The weber throttle bodies are staged and the secondary doesn't start to open until the primary is about half way open. Interestingly enough the car seems to run great (better than petrol) when just running on the primary and is so smooth. When it was on petrol you could really feel it when the secondary barrel opened but with the gas it isn't quite as noticeable, but overall it is great and cheap as to run. I guessed the power up top was maybe due to the lack of the throttle pump in the carb as well as flow limitations of the log but the 2V head should solve that, now I just need the time to put it on !!
The inlet in the log was taken out to 52mm when I first fitted the weber carb and can't go much bigger or there will be no gasket surface left.
Cheers D :D
 
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