340R Colin's Honda Conversion

[MacLotus]

Deleted

[Gourlay83]

Not sure Ken,

a 3 inlet/outlet regulator ? and that T..... mmmmm.

I have exams all next week, so Colin's car is last thing on my mind. Struggling a bit to be honest, gave myself far too much to do .

Properties of Materials and Statics on Tuesday

Alan

[MacLotus]

Deleted

[Mikie711]

Ken, your first drawing is basically the same as every OEM install just with an extra pump. Not sure that would work as the OEM pump would still be fighting back pressure and would have to overcome the second pump before tripping the regulator. You could end up pressuring up the lines before the second pump and burning out the OEM pump as there is no relief prior to the HP pump.
Second drawing is how to install a swirl pot and yes the it can help to supply a constant fuel pressure to the fuel rail in long corners but the biggest advantage is not that. The swirl pot is supplied by a low pressure high flow pump. The original pump will do because it will happily provide more flow at less pressure. The flow from the oem pump feeds the swirl pot and returns to the main tank, no regulator hence the low pressure circuit. It has nothing to fight against other than hose internal bore. Usually you get 2 sizes of fittings on a swirl pot, say 3/8 and 1/4 npt or 1/2 and 3/8 something like that. The big ones take the feed from the OEM pump and the smaller ones take the feed to the new high pressure pump and on to the fuel rail. This is where the honda looks like it differs from others I have seen. I am used to seeing the regulator after the injectors which keeps a constant pressure in the fuel rail. Guess it would work the same the way you have it drawn.
Having the swirl pot feed the HP pump means your fuel pressure can be huge as long as the flow from your low pressure pump can sustain the required flow at full throttle. The flow rate can be checked by running your stock pumps outlet hose into a large measuring jug for a set period, this will let you know if it can supply the required flow. Might have to jump out the relay as it looks for a signal telling it the engine is running but I am sure you get the idea.
What this all does is saves you having to fit a fully baffled tank or one with a swirl pot welded in and high pressure pump as Alan has done. Colin bought the car with a small fuel tank that has a chamber welded in with non return valves in it to restrict fuel slosh in corners, a swirl pot. The pumps that you get to change out the OEM for higher pressure, higher flow applications are seldom two stage pumps, walbro's are all single stage, which can lead to problems in long left hand corners in the Elise's case, but also means access to the fuel system is much easier should you encounter a problem. As a by product it also cools the fuel to a certain degree. Without going to the expense of fitting a fully baffled tank the Walbro pump is IMO crap. I fitted one to my sprint Elise and couldn't run less than about a 1/4-1/3 of a tank if cornering hard and it didn't have to be a long corner.
BTW it doesn't have to be a swirl pot you could just use a large filter as long as the low pressure pump supply's sufficient fuel flow.
Third drawing is ............ had you been drinking again?

quick search found this

Sorry if this has been covered already but can't be bothered looking back.......... .

[MacLotus]

Deleted

[roadboy]

I'm dumbfounded by the pointlessness of this discussion.

Dan

[Shug]

I'm dumbfounded by the pointlessness of this discussion.

Dan

Helpful Dan, helpful. Wrong side of bed?

[MacLotus]

I apologize for that Dan. I'm just getting ready to buy the parts for my fuel system and wanted to get feedback from those who may have insight. I'll let it rest as I think I understand the pro's & con's of various designs. Thank for your input guys.

Ken

[roadboy]

[andyc]

Guys....can I suggest the 'swirl pot' topic starts a new thread instead of totally hijacking alans!
I dont understand any of that technical mumbo jumbo.....I just want to see pics of Colins car

(And stop being so grumpy )

[jen]

Alan is in the garage now and progress is coming along, Im sure he'll be along shortly but I couldn't resist posting this.

He finished off the wiring last night and was sorting some loose ends today when he couldn't work out why the starter wasn't working, so he asked me to come out and help test some connections. Within about 5 mins, he asked me to turn the key to start the engine, so confused, I said "doesn't the 340r have a push button start?" he looked at me and burst out laughing! He totally forgot it had a button to start! Oops!!

[tut]

muppet............



tut

[Gourlay83]

Aye Aye, alright. I've had a tough week.

I finished the wiring yesterday but can't start it due to no exhaust system. I thought I would test everything to make sure Engine Turns over, Fuel Pump primes etc ...

Everything was working as it should but Engine wouldn't turn over. Tested all my feeds and found that no switched live was coming from the key. Spent a good hour testing things/scratching head when Jen asked "Doesn't 340r use the Button". Laughing away I pushed the Start Button and the Engine Turned over.

I'll take the Dickhead of the Day award.

Alan

On a postive note - Engine has 230psi in every cylinder and everything is working as it should. When I tidy up all the wiring i'll take some pictures.

[Gourlay83]

Only have the 02 sensor to do which can wait until Jim's been round.

[Mikie711]

Nice job Alan, I know how much time this sort of thing takes.

Top job. (good cylinder pressures BTW, same as mine.....was )