lpg feed pipe size on 500 bhp engine.

[LPGC]

Nice one!

[robertXX]

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 .

[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.......

[robertXX]

indeed !


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




to cobble together ,yup , they are Ti too.

[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.

[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...).

[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!

[robertXX]

Right ,redesign done ! , take off now from the rad feed pipes ,and outlet to the pump .should be nice n hot .

[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

[robertXX]

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 .














regards
robert

[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

[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 .

[LPGC]

Medusa almost turned me to stone mate
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

[robertXX]

Medusa almost turned me to stone mate
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.

[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

[LPGC]

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

How long before complete do you recon. Just so we all know when to expect a spin in it

Will bring a gas bottle

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!

Simon

[robertXX]

How long before complete do you recon. Just so we all know when to expect a spin in it

Will bring a gas bottle

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 !

[LPGC]

You seem to do alright yourself with settings and everything else Rob

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

Simon

[robertXX]

i bet ...sniggering as well !

[robertXX]

well progress.....

https://youtu.be/zoFhnQ6AI1I


https://youtu.be/4F-88X1DM9w