Extractors on LPG GQ

[SiNH]

I was out looking for extractors for my TB42 and came to a dead end after talking to a reliable exhaust guy.

Everything was going well in the conversation, got the price and brand of the extractors and I was all excited when thinking about the potential for extra economy and power when running on petrol.

After getting the details of price and brands and the next available time I mentioned Im getting 25L/100 on petrol and 350Km on a tank of LPG, his face expression suddenly changed.

The exhaust guy said, I can get the extractors in and install it for you and take your money or I can tell you the truth and lose a sale. He told me that LPG engine runs very hot and fitting extractors on wouldnt be a wise investment because they will crack in a few months, not may crack but WILL crack. He recommended that I stick with the current OEM setup cause the stock one is cast iron and thicker walls thats why its fine running LPG on them. The aftermarket extractors are usually stainless or mild steel and all have thinner walls that the OEM units and will cause a problem.

I asked him if I can heat warp it and he said that it will crack faster due to trapped moisture in the wrapping.

He didnt know of any specific designed extractors that were designed to run with LPG and hence I am here ask you guys if you can recommend a brand of extractors or who does them or wether you had extractors on LPG patrols anyways and if you had problems.

Can I get some feedback on extractors on LPG systems?

[viperguy]

i got straight lpg and have extractors on my tb42 gq.

reason i got extractors? i had a massive crack in my original cast manifold that was almost the whole way around the v in the 3 into 2 part of the manifold. so i think the increased temp from running lpg may affect both systems.. just make sure u get a good quality set of extractors and u should be fine.. extractors are used with all sorts of hypo motors that will make more heat than ur tb42 will make so it shouldnt be a major issue..u wil get a bit of extra under bonnet heat but cracking of the extractors prematurly should not enter the equation.


after fitting extractors however my tune was way outta whack an needed a whole overhaul of my lpg system to get running again.. apparently the scavenging effect of extractors works extra well with gas and u need to retune to avoid leaning out of mixtures..

[Beastmavster]

I wouldnt think that extractors should be a problem with LPG with a good quality set.

An LPG engine does run hotter but shouldnt that much hotter - not enough to make a set of cast iron extractors fail due to heat anyway.

As mentioned normally the factory exhausts are weaker than any good aftermarket set so I can't see any reason why not.

Maybe the guys just talking about the el cheapo set he flogs to people

[SiNH]

I wouldnt think that extractors should be a problem with LPG with a good quality set.

An LPG engine does run hotter but shouldnt that much hotter - not enough to make a set of cast iron extractors fail due to heat anyway.

As mentioned normally the factory exhausts are weaker than any good aftermarket set so I can't see any reason why not.

Maybe the guys just talking about the el cheapo set he flogs to people

He said if I want it the one he supplies are Lukey brand, but he can also get in Hurricane. I think Lukey is better quality than Hurricane.
His comments were in reference to these two brands, how they have thinner walls than the OEM unit.

[viperguy]

where u at mate? i bought hurricane.. fitted myself.. no problems so far...

[SiNH]

where u at mate? i bought hurricane.. fitted myself.. no problems so far...

Liverpool area.

Just had my 93 TB42 Maverick for just under a month, only went offroad to Stockton over the 28/29 May weekend.

Where did you get yours retuned? thats my next question after the extractors were fitted?

[viperguy]

ure in the right area.. i got extractors from liverpool exhaust and my lpg work at cresent motorsport..also in liverpool.

liverpool exhaust actually make the hurricane extractor brand inhouse.. cost me 220 trade including gasket. no problems so far have had for about 3 mnths. will cost u more if not a trade customer.

cresent motorsport ia a race workshop that specialises in lpg performance. i have a straight lpg set up using ohg lpg gear and joe at cresent has been the only guy so far that has had any idea how to tune it. tuned it on the dyno and got it running sweet. he works with all systems (impco etc) so will sort u out right.. not expensive either. i was very happy with him...call joe on 9600 6229 maybe talk to him before u do extarctors and he will tell u best set up for performance and economy on ur vehicle. cheers steve

[SiNH]

ure in the right area.. i got extractors from liverpool exhaust and my lpg work at cresent motorsport..also in liverpool.

liverpool exhaust actually make the hurricane extractor brand inhouse.. cost me 220 trade including gasket. no problems so far have had for about 3 mnths. will cost u more if not a trade customer.

cresent motorsport ia a race workshop that specialises in lpg performance. i have a straight lpg set up using ohg lpg gear and joe at cresent has been the only guy so far that has had any idea how to tune it. tuned it on the dyno and got it running sweet. he works with all systems (impco etc) so will sort u out right.. not expensive either. i was very happy with him...call joe on 9600 6229 maybe talk to him before u do extarctors and he will tell u best set up for performance and economy on ur vehicle. cheers steve

Thanks for that. I will check them out on Saturday if they are opened. I found them in the yellowpages.
Im glad that there is a good tuner near home.

[viperguy]

tell joe that steve in the lifted white short wheelbase sent u.. he will look after u

[jessie928]

you wont have any dramas with extractors on an LPG patrol
i put about 400,000km's on a hurricane set no drama's

you could get them HPC coated, which would be a good idea because it will reduce underbonnet temps HEAPS, make sure you get a flange welded onto it first ( carnt remember if it came with one) and that the flange is on the 2 1/2 inch section of the pipe

Jes

[matsmad]

I had a set of Genie Extractors on my LPG mav which i owned for over 2 years. Ran LPG 95% of the time and drove it pretty hard. No problems whatsoever. I even sold the extractors after i dismantled the car from a rollover and they were fine. Same as Viperguy, my factory manifold cracked all the way around.

[Hoonz]

if they were going to crack they wouldn't put them on race cars now would they?

i've seen extractors glowing red many times and they don't crack

[ludacris]

I run pace mackers and they are that old but still going strong.

LudaCris

[Screwy]

how much did u guys pay for ur extractors?

also did u get the zorst bent up to suit them, and wat that end up costin ya and who from?

im thinking of getting extractors and zorst put on my LPG TB42 SWB so curious is all....

cheers

[Beastmavster]

got extrtactors on mine - definately needs a retune with them since there's a huge flat spot around 1600-1800.

[adam.s]

mine were about $220, I'd expect a v8 to cost significantly more though for obvious reasons.

[dwaynes]

so where a people buying for that price i keep getting quoted 400 + for supply and fit

and not one place i have rang has mentioned that they crack

[Screwy]

mine were about $220, I'd expect a v8 to cost significantly more though for obvious reasons.

we are talking about TB42 straight 6 here not v8 hey

[viperguy]

sydney guys.. liverpool exhaust does hurricane to suit td and tb 42's..can get them for guys trade prices if they like

[adam.s]

mine were about $220, I'd expect a v8 to cost significantly more though for obvious reasons.

we are talking about TB42 straight 6 here not v8 hey

I'm talking L28, but the price should be very similar/same for TD42.

And yes, your's are gunna cost a hell of a lot more

I dunno if I would even bother if I was you to be honest, you should have enough power as it is, and the money you will spend on extractors will make sweet fuck all difference back in power.

[Screwy]

mine were about $220, I'd expect a v8 to cost significantly more though for obvious reasons.

we are talking about TB42 straight 6 here not v8 hey

I'm talking L28, but the price should be very similar/same for TD42.

And yes, your's are gunna cost a hell of a lot more

I dunno if I would even bother if I was you to be honest, you should have enough power as it is, and the money you will spend on extractors will make sweet ***** all difference back in power.

this is for my GQ, TB42 not for my MQ, i dont ask questions like this about my MQ these days mate.

Tb42 with extractors will give me an advantage on hill climbs while towing the MQ

[RN]

Mate reckons all GQ'as crack their manifolds over time. He has had 3. Also has a GU petrol with turbo, 220 kw and the heat has warped the stainless steel system and now had had a massive internal haemoragge. Possible cracked bore but awaiting the final diagnosis.

Heat is a killer.

RN

[GUEEY]

Pacemakers! The best brand extractors for a TB42 Motor. Not the cheapest , but are the extractor of choice for flow an performance.
Had them on 2 Gqs over the past 10 years and have them on my current 4.5 GU.

Cheers Grant.

[jessie928]

GUUEY,

have you tested other brands on a dyno? if so could you post some comparative figures so we know where the increases in performance are if any?
cheers,

Jes

[ludacris]

There are extractors then there are performance extractors. Buy a set that have mandrel bends in them.

LudaCris

[jessie928]

if you want low end torque, you will need some restrictions in flow....
BTW

[viperguy]

im with jessie on this one.. noticed my power curve shifted up the rev range with extractors and 2 1/2inch exhaust fitted. id only go extractors if my standard manifold cracked etc..most of the gains u woulg get would be from a free flowing exhaust..

having said that im on straight lpg and have it fine tuned for lpg and power aint a issue anywhere in my rev range..

[bazzle]

There are extractors then there are performance extractors. Buy a set that have mandrel bends in them.

LudaCris

GENIE Perfomance headers,

Bazzle

[mickyd555]

mandrel bent genies on my TD42 have made a noticable difference, but more so i have lost compresion braking to an extent, therefore it doesnt need to be reving out as far to go at whatever speed

[GUEEY]

GUUEY,

have you tested other brands on a dyno? if so could you post some comparative figures so we know where the increases in performance are if any?
cheers,

Jes

Dont now about other brands, but what i do know is that Dynomotive in melbourne who are tops in there feild built me a high performance TB42 motor for my shorty mav a few years ago and told me to have pacemakers and exhaust fitted by Unique exhuast who does alot of the melbourne based Comp trucks.Rod from Unique said the Pacemakers were by far the best off the self extractor for the Patrol.
Have always gone for Pacemakers since.took the word of a Top Dyno and Exhuast company.