Gas research and OHG X1 converter

[Anonymous]

I bought an older model gas research carb with an OHG X1 converter a few years ago (secondhand) for my long running turbo x-flow project.

The motor is complete. Priase the Lord. I have a cast turbo manifold (split pulse, matches the turbo) and bought a delta gate cheap on e-bay which should arrive in the next fortnight.

I have an airod LPG system which won't work on a turbo.

Does anyone have experience with the gas research mixer and OHG X1 converter? I rang Gameco who supply OHG stuff. Craig said the converter won't work properly with the Gas research mixer, the primary pressure in the converter is too low and the secondary too high.

Gas research just want to sell me 2xB2 converters at $175 each plus an extra lock-off.

I would really like to use the X1 as i already have it and it is supposed to be good to 330 rear wheel HP.

Anybody got any advice? XECUTE can you confirm the rating of the OHG converter?

 

[xctasy]

I've seen an X-1 freeze up on a worked 308 with an Amos ring. My mates HX Statesman.

The Over the Hill Gang stuff is nicely arranged, but there is no lean cruise, or any way to make it respond to the pressure signal like the E-series Impco does. It was designed by the same people who did the Impco stuff. I has to run a balance line for a turbo installation, and I know how to hook one up from the Impco Service bulletins and manuals I've studied. It's not impossible to do.

I cant confirm 330 hp for the X-1, but the OHG 450 carb was supposed to be a 250 hp + carby, so who knows?

The Century based numbers Leigh and the team at Gas Research use are another step up; state of the art, and will work really well because they did all there product development using that stuff. The B-2 is a US Century rip-off, built under liecence, as I understand the info I've read.

The X-1 is limited by its steady power limit with the liquid propane. It freezes solid after a minute of supplying a 250 hp 308, so maybee its not as good as the Impco E, B-2 or Century. I've seen these others hit the 300 plus mark without freezing.

I know nothing about post Impco stuff. It was the ducks guts in the 80's. I find something and stick to it. Haven't got the money or information on B-2, X-1 or Century converters to even contemplate running one.

 

[DYNOED250]

i thought a b2 and an imco e was the same sorta thing......

my mates doing a turbo set up, i was thinking of a gas re-search, fb and two imco model e/l-converters t-pieced together, i know u have to run boost to the balance port in the converter but i was looking at the model e-converter they have a plug u can undo and put a fitting in but they also have a wire mesh plug which says do not plug ????? i figure it wouldnt work with boost reall good if this wasnt plugged as the boost wouldnt act on the converter as it would simply bleed of through this brass wire plug thing ?? any ideas

not sure if it was an e or l but it was a hudge converter im thinking it was an e , im just wanting to know what mods u have to do to use them with boost, and also can u use the diaphram set ups, like the ca 225 mixers and things, or dont these respond to boost reall well, i was looking at them today at work and theres a plug in the back diaphram i figure u could pipe boost into to even it all out so it wouldnt force to diaphram shut ? but im not sure if im right wrong or of the track all together

 

[xctasy]

The Impco E has a couple of version. Early ones were built wiothout lean cruice EC1 modules, and the wire mesh bit is where the balance tube is placed to allow the LPG to be referenced against the boost.

There is the Impco technical bulleten which explaines it all. It dates form 1984, and was used for stationary industrial gas turbos as well as the sort of turbos Ak Miller made for the Ford motor companies 2.3 Fairmonts in the early 1980's.

Give me some time, and I'll post it.

Unlike Aussie, NZ'ers have a massive amount of old Impco gear lying around. Theres no point buying new stuff when the old stuff is so reliable and cheap. I think Overdose posted me a picture of a B-2, and it lookes like an Impco E for sure. So I was wrong about it being a Century. However, Leigh Sharples from Gasrearch was saying the GRA stuff was designed around Century converters.

From a c.1997 Street Machine article

Leigh's straight gas installations require a converter that's very sensitive to engine vacuum signals, and so far only the USA-made Century converters have the right inbuilt demand sensitivity. These converters come in sizes from 150 to 400 hp, and must be matched to the engine's gas demands, otherwise the converter (particularly on cold days) simply freezes solid!

Dunno what happens with a GRA turbo, and if a b-2 becomes okay then. Who knows?

X-1, B-2, Bannanas in pajamas. All the same to me!