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Re: lpg feed pipe size on 500 bhp engine.

Posted: Mon Nov 16, 2015 9:56 pm
by LPGC
Nice one! :D

Re: lpg feed pipe size on 500 bhp engine.

Posted: Tue Nov 17, 2015 9:22 am
by robertXX
Gilbertd wrote:That sounds effing gorgeous!! I'll be home sometime tomorrow night so will get that R90E in the post to you on Wednesday so you'll have two decent ones.

thanks gilbert ,i like it too , should sound even better when i richen up the front engine and then get some headers on it . :D

Re: lpg feed pipe size on 500 bhp engine.

Posted: Tue Nov 17, 2015 10:51 pm
by Gilbertd
I've got a pair of stainless steel tubular headers for a Series 1/2 E type in my garage that I considered donating. Then realised that a) you'd need two sets, and b) the older XK engine has the exhausts on the opposite side to the later AJ6 that you are using. It would look pretty stupid with the pipes pointing forwards.......

Re: lpg feed pipe size on 500 bhp engine.

Posted: Wed Nov 18, 2015 12:12 pm
by robertXX
indeed !


as part of the master plan , i have been collecting these ..

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to cobble together ,yup , they are Ti too. :)

Re: lpg feed pipe size on 500 bhp engine.

Posted: Thu Jan 19, 2017 9:05 pm
by robertXX
ok doke , here's a question .

i am at the point where i am plumbing on the water feeds to the reducers . i have taken the bottom input to the water pump outlet , so that's under pressure ,the returns from the top of the reducers i was going to connect to the pipe coming out of the head of each engine ,that goes to the radiators.now it occurs to me that pressure wise , my highest pressure is from the pump to the engine ,then from the engin to the rads ,then ,lowest system pressure should be in the pipe from the rads to the pump.

the question is , will i get enough flow through the reducers if i plumb the return into the engine to rad pipes ?

regards
robert.

Re: lpg feed pipe size on 500 bhp engine.

Posted: Fri Jan 20, 2017 6:56 pm
by Gilbertd
Normally, but I admit there isn't much normal about Medusa, the reducers would be plumbed in the heater feeds. In series with the heater matrix if it has a full flow heater system or in parallel if the heater temperature is controlled by a valve. That way you get flow through the vaporiser(s) immediately before the stat opens and directs flow through the rad. Even if you aren't going to be fitting a heater, I would assume the outlets are still there? Connect the vaporisers where the heater matrix would be (if you had one...).

Re: lpg feed pipe size on 500 bhp engine.

Posted: Fri Jan 20, 2017 8:06 pm
by robertXX
thanks Gilbert ,unfortunately the heater take offs are not there . but i think i need to do a redesign .

I realise that if the reducers flow a fair bit then water is going to do a loop out of the pump through the red then back into the pump .not going through the engine at all/

I had assumed the red would be very restrictive , but i am now thinking that's a bit of wishfull thinking , i need to move the feeds to the reducers to the pipes from the heads to the rads ..bumm!

Re: lpg feed pipe size on 500 bhp engine.

Posted: Wed Jan 25, 2017 9:04 pm
by robertXX
Right ,redesign done ! , take off now from the rad feed pipes ,and outlet to the pump .should be nice n hot .

Re: lpg feed pipe size on 500 bhp engine.

Posted: Fri Jan 27, 2017 11:30 am
by LPGC
I've stayed quiet because I know the standard heater water flow setup on the Jag straight 6's is a bit unusual, remember a bit of head scratching on a few occasions when plumbing reducers in on them myself and that was without the heater circuit blanked off! A lot of vehicles use a circuit involving something like heater output comes straight from the pump and return uses same input as rad return, but I dunno if you mean using pump output as reducer output and rad input as reducer return. This would be like piping reducer in series with the rad only bypassing the thermostat? It's picturing what you mean I suppose.. But what I just said would mean engine warms up slower, might run cool and reducer might not get as much flow when stat opens. Unless you mean pump output and rad return? That would mean pump flows water in a closed circuit just involving pump and reducer, but still would expect enough water mixing to keep water flowing all through engine and the reducer hot. Slightly different subject - I might guess but still interested to ask in how you're plumbing 2 engines to one rad if that's what you're doing?

Simon

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sat Jan 28, 2017 2:30 pm
by robertXX
LPGC wrote: Slightly different subject - I might guess but still interested to ask in how you're plumbing 2 engines to one rad if that's what you're doing?

Simon

Simon , i have a small block ford moroso electric water pump ,, this has two legs pumping out water ,and one inlet. i swapped the front engines water manifold around so the output legs of the pump now connect to the two water manifolds on the blocks .water then comes out of the each engine ,and goes to its own mg metro turbo mk1 aluminium radiator , of which there are two ,mounted in the grill.

(i use these rads in the turbo mini i have ,time will tell if they are sufficient , i have a big range rover rad i can put in the tail if i need more cooling .)

when the water comes out of the two radiators , the two outlets join into one pipe ,that then goes back to the pump inlet .

my reducers are connected at the bottoms to the pipe flowing from the engines to the radiators front engine pipe feed the front reducer and back radiator pipe to the back reducer . the top connections form the reducers connect to the water pump inlet . effectively the reducers are in parallel with the radiators .

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regards
robert

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sat Jan 28, 2017 10:03 pm
by LPGC
Bloody hell Rob, all I can say at this point is that your setup is outside the realms of my own and probably most people's experience! I reckon you'll be better informed on what will work and what won't regards cooling. Looks like being a matter or try it and see? ;-)

Simon

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sat Jan 28, 2017 10:10 pm
by robertXX
haha , so much of the car is try it and see Simon , i should make a list of what i think can go wrong ,and award each line with a betting odds as to whether it actually will work or not .

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sun Jan 29, 2017 4:33 pm
by LPGC
Medusa almost turned me to stone mate :lol:
Out of interest, why go with the electric pump etc? Couldn't you just have run both engines with their existing water pumps and made water manifolds to T both engine's top hose / bottom hose connections (so engine water piped in parallel) respectively, to one or two rads (parallel rads if using 2)? If the back engine is mounted close to the front I can see why you'd want to remove the rear engine's pump...

Simon

Re: lpg feed pipe size on 500 bhp engine.

Posted: Thu Feb 02, 2017 8:55 pm
by robertXX
LPGC wrote:Medusa almost turned me to stone mate :lol:
Out of interest, why go with the electric pump etc? Couldn't you just have run both engines with their existing water pumps and made water manifolds to T both engine's top hose / bottom hose connections (so engine water piped in parallel) respectively, to one or two rads (parallel rads if using 2)? If the back engine is mounted close to the front I can see why you'd want to remove the rear engine's pump...

Simon

well , i had the pump already so it was not an additional expense ,also fitting the manual water pump at the front would spoil the line of the body because it sticks out past the grill , and there is no front pulley on the back engine so no v groove for it .

This type of pump is fitted on up to 7 litre v8's ,so it will be interesting to see of it can keep this bastardised conglomeration cool or not .



regards
robert.

Re: lpg feed pipe size on 500 bhp engine.

Posted: Fri Feb 03, 2017 12:07 am
by classicswede
How long before complete do you recon. Just so we all know when to expect a spin in it

Will bring a gas bottle :lol:

Re: lpg feed pipe size on 500 bhp engine.

Posted: Fri Feb 03, 2017 1:30 pm
by LPGC
robertXX wrote:fitting the manual water pump at the front would spoil the line of the body because it sticks out past the grill , and there is no front pulley on the back engine so no v groove for it .
Doh! Yeah or course... It would be a bit of a pain changing belt on rear engine considering the cranks connection :roll:
classicswede wrote:How long before complete do you recon. Just so we all know when to expect a spin in it

Will bring a gas bottle :lol:
Picturing a crew of us on Medusa, big grins all round, dropped jaws and a fair bit of rubber necking from others... Spin maybe the operative word... Let me bring the gas bottles and you bring the tyres Dai! :lol:

Simon

Re: lpg feed pipe size on 500 bhp engine.

Posted: Fri Feb 03, 2017 8:56 pm
by robertXX
classicswede wrote:How long before complete do you recon. Just so we all know when to expect a spin in it

Will bring a gas bottle :lol:

Hi Dai ,


i am hoping this summer ,but not really sure , just plod away at the separate jobs till its done .

I am in the position now where ,with a bit of wiring and the dash in, it will be driveable ,,although without a working hand brake .



regards
robert.


oh ps , yes Simon that would be a great laugh ,and i am sure i would end up with the best settings on the lpg system i could have !

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sat Feb 04, 2017 8:56 pm
by LPGC
You seem to do alright yourself with settings and everything else Rob :lol:

Last time me and Dai were in a car together we were doing ton-up on Anglesey in a P38.

Simon

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sat Feb 04, 2017 9:50 pm
by robertXX
i bet ...sniggering as well !

Re: lpg feed pipe size on 500 bhp engine.

Posted: Sun Apr 09, 2017 8:36 pm
by robertXX