Something different that you guys can help me with

[Pepe]

Hi guys, just wanted to throw some ideas your way, I have a mk1 golf, 1.5 jb 70 bhp carb engine and as fun as it is I'm after abit more and I'm going to do the bay this winter so it's the perfect opportunity, my only issue is I walk around the show fields and really fancy something different to whacking in an abf/g60/20vt etc etc, so that got my creative mind wandering, so I remembered reading winston's g40 carb turbo thread and really love the simplicity and left field nature of it.

soooo (I bet you can see where this is going ) I took to the drawing board, my engine is 8:2:1 compression ratio and the g40 is 8:0:1 so not a million miles away! And there's a massive void in the bay...



all being well what I want to do is use a completely bog standard g40 charger (I'm keeping cost down and not chasing figures etc just want to be abit different) I can use the twin port vacuum canister (a la kjet turbo) on my dizzy for ignition advance/retard, use a r5 gt turbo carb, take advantage of then V belt setup that is already running my alternator and waterpump abit of custom fab work to mount it, custom pipe work/inter cooler etc and have some fun with a relatively inexpensive engine, I have another one that a friend is letting me have so I've not got much to lose. But I have a few questions regarding the g40 g-lader that I hope you guys can help me with

1. if I cannot get a r5 carb for a reasonable price I'm going to have to use a different carb, so I would need to know what psi the g40 puts out?

2. Oil feed, does the g40 need one or is it like the m45 "lifetime" oil setup?

3. If it does need an oil feed, I'm guessing I take it from the sum, but where do I return it?

4. How much should I be paying for a standard g40 charger?

5. Any size restrictions on intercoolers etc

6. What sort of increase would it make, so I can plan brake conversions etc?

7. thoughts?

Cheers guys

[jez1272gt]

1. standard boost is 0.5 bar approx 7 psi on standard pulley.
2. G-lader needs an oil feed. This is picked up from the back of the cylinder head on the g40.
3. I dont know your engine at all, but the feed will most likely need to be picked up from the oil pressure sensor by way of an adapter. The return would be to the sump.
4. A standard charger depending on mileage and condition will be around £200
5. No real intercooler size restrictions, the standard coolers arnt particularly large and these can be picked up for around £20 second hand.
6. A standard polo gt is 75bhp. If your engine is 70 bhp and in good condition you might make as much as 113bhp. This is a total guess though, it would be interesting to see the outcome!
7. Give it a go. always good to see people doing different things. Im sure there are other considerations which people will mention.

Best of luck...

[Agent47]

If you can't find a r5 turbo carb I think Renault did a 1.7 carb turbo and am pretty certain that engine was shared with Volvo in there 440 and 480.

[Agent47]

Or this if you're quick, (ebay item number) 331290298865

[GR40]

If you are looking for something out of the norm to do, why not using an m24 charger out of a newer vw! They are small and I think they can make up to 1bar. They don't require an oil feed or return, noone has done one before and you could probably make a drow through setup and use the standar carb. A blow through setup will make more power but a drow through is way easier to make since it doesn't require an intercooler or a blow off valve. The difference between the two shouldn't be more than 10hp. You could easily fit multi-v pullies out of 90's models vw and with some custom brackets it shouldn't be too hard. The standard G40 chargers are just too much maintenance in my opinion.

[Pepe]

I chose the g lader because of ease of use really, I has a v belt pulley so I can use my existing auxillary belt set up to power it! I want it to be as simple as it can be but work well

Great shout on the 1.7 turbo carb I'll look into that hopefully being a solex carb they will bolt on to my inlet with very little fuss like the r5 one does!

I'm pretty sure the mk2/3 polo uses a 1b3 carb as my 1.5 does so depending on my success it could be a good way for people to charge lower powered polos aswell

Thanks for the info so far guys!

[GR40]

Well I wouldn't call it ease of use with a g lader. From my experience with those they are overpriced, mediocre on power and flow, hard to service and can blow to pieces for no apparent reason! Remember that you will still have to make the oil system for it, mount it with some custom brackets and the with the v belt setup you will still have to change the pulleys as the charger needs 2 of them to function properly. Its way easier to simply upgrade a couple of pulleys in my opinion and go with an eaton that requires no oil system or service but hey, it's your project not mine.

[Pepe]

You make some very good valid points there man, not really concerend myself with making anymore boost/power than a g40 as its still unexplored ground, but I will look into the physical size of the eaton chargers m24 would probably be best but I'll look non the less

with the pulley situation I suppose I could do it as I've got a few alternators from 6n/mk3 golf I've broken in the past so it would be a case of swapping the bottom v belt pulley on the water pump, and crank for the ribbed belt(don't know if that's possible? I also have an abd for parts that I could possibly scavenge off, a couple of close friends are fabricators and I was gonna get one of them to machine me a twin vbelt pulley and just swap the 1 pulley but maybe your right if I'm down there swapping pulleys it might pay off, they will be helping me mount it, weld in the oil feed to the sump etc my neighbour is a forklift mechanic and has everything I need for the lines etc so that wasn't a problem

Also I might be worth it to keep the period look but I will take myself back to the drawing board and see what else is available to convert the old big block the ribbed belt!

Cheers again I'm glad I came here some good ideas!

[PeteG40]

You'll want an oil feed from the head, drain in the sump or back in the block.

[Pepe]

Yeah I'll take it from the piece where my vdo gauge sender and pressure switch are then replace the oil filter housing for a threaded one and move my oil pressure switch down to there, then weld on an inlet to the sump, what thread is the oil feed/return in the glader?

[hayesey]

m10x1mm

[Pepe]

Perfect cheers

[PeteG40]

oil the drain is m10x1.

The feed is a fine pitched m8.

[hayesey]

what's m8?  the fitting into the head is m10x1mm.  The t-piece I have on mine is made with a brake pipe fitted brazed onto a drilled and tapped block of brass.  Or am I misunderstanding something?

[PeteG40]

The feed at the head us m10x1

The feed into the lader in the lader itself is m8fine.

The drain in the g lader is m10x1
The drain fitting on the block is m10x1