Rwd 3s (sucess!)

[essaysixtythree]

That is hot as. So that is using a section of 3s intake manifold with 4age itbs bolted to it?

[metcap]

yeah we were working on a budget and making up a new manifold to fit would've taken up much more time and effort. It dun look the best but the noise it makes is beautiful!! Beats any weber I've seen/heard thumbs down...and not to mention it drives great too, slides the rear with ease with 15" wheels.

[essaysixtythree]

Just a quick update. I have bought a pair of solex 40s! I was a bit worried I may have to rebuild the intake manifold if the outlets from the carbs were spaced differently to the intake ports on the 3sge head. Was hoping being a toyota 4 and the carbs being from a toyota 4 18rg/2tg that the spacing might be the same. It is. 90mm centre to centre between numbers 1&2 or numbers 3&4 intake ports. 90mm centre to centre of the bores on the carbs! Too easy. Now I just have to wait for holidays.

[senn]

The intake noise of this thing is going to be mental, it's the one thing i really miss about owning a carby fed car (fuel hitting fast moving air....just awesome)

Will the carbies have an airbox/plenum cover kinda setup on the intake side, so it can have a CAI fitted, or are you just going to chuck filters on and pipe cold air in with an old intake hose of something else?

Will you be getting it dyno tuned, or just going for a rough tune on the road?

[essaysixtythree]

Just a couple of lynx ramflo filters. I cant afford ram tubes. Well I could probably but I cant justify $100 bucks for two shiny bits of pipe then $50 for the two filter socks. Hadnt really thought about cai. I have the cai from the old carb which is still sitting there and will funnel some air in that general direction. Bit of pipe on the end of it to get it going straight at the filters and it should be quite nice i reckon.
There will be no dyno tuning. Il see how they go and rejet them if im disappointed. But I highly doubt I will be

[brucey]

Did the inlet manifold align up with the manifold bolts on the head?
What manifold are you using, 18rg or 2tg?

[essaysixtythree]

Neither. Home made manifold mate. Basically its lasercut plate with some 50mm sections of exhaust pipe welded on it.

[mattysshop]

i would suggest you use ally, NOT mild steel...

i made a pair of manifolds to run twin 40mm solex's (18R-G) carbs on a tickled 18-RC i had aaaaaaaaaages ago.. wasn't that heard really.. the welding was a little less than desireable.. but hey.. was my first time TIG welding ally! have gotten much better since then..

IIRC there are many places that sell sand cast ally manifolds in the DCOE pattern for 3S/4A's...

one place over the creek in NZ had them on the shelf.. Racetech in Petone.. but i'd check out Ebay... trust me.. this isn't somthing you want to do with aluminised exh tube..

[essaysixtythree]

Alright people. Manifold, carb linkages and exhaust done. Went to take it out of the front yard today and it doesnt like it. Idles happily revs up happily. When you go to take off, put load on the engine it hates it and there seems to be a fair bit of exhaust smoke. Too lean too rich? Please tell me that the bores havent glazed and I havent just made an expensive oil burning smoke machine.

[Wil8115]

the weber 32/36 is rated at 325cfm. even at 8500 rpm and 100% VE the 3SG(1998cc) is only using 298cfm(i rounded up a tick). tuning it with the right length intake runners will help better on the top end more then a bigger carb but having said that, a 38/38 weber is a great carb.

personally I like the adjustbility of holley model 2300 2 barrels better.(350, 500, 650cfm's)

[Wil8115]

Alright people. Manifold, carb linkages and exhaust done. Went to take it out of the front yard today and it doesnt like it. Idles happily revs up happily. When you go to take off, put load on the engine it hates it and there seems to be a fair bit of exhaust smoke. Too lean too rich? Please tell me that the bores havent glazed and I havent just made an expensive oil burning smoke machine.

you may need to adjust the accel pump squirt up or down. does it fall on it's face or does it seem like a bogg? what color is the smoke?

find some country road and do a WOT pull in 3rd gear... shut the engine off and coast to a stop. pull over and inspect the spark plug, caution they are HOT!!(use gloves) if its black, its rich, if its light brown, thats pretty close, if you see white specs, it's lean.

[essaysixtythree]

Smoke is white then blue under load thus I suspect rings have not bedded in properly. But it seems to have quite some compression as the starter struggles to turn it more than once with the plugs in. Pull the plugs and it turns continuously.

Pull apart and inspect?

[essaysixtythree]

I have stripped down the engine and re honed the cylinders. The head gasket seemed to be sealed well and there was no water or oil evident in the cylinders. I am thinking that perhaps this could be a valve stem seal issue. Although they are new perhaps one didnt sit down and seal up properly. Is there anyway to test the valve stem seals without taking the valve springs off. If I hold a valve open and feel the top of the seat will it be oily enough to notice?

The engine is definitely burning something nasty as tops of pistons are black after being run less than half an hour. Symptoms are white smoke at idle. Engine is happy to idle and rev up. When load placed on the engine lots of blue smoke and it struggles to get the car moving. It only just made it down the street and back. Spark plugs are black and smelt like petrol.

Any ideas on what the cause is would be greatly appreciated because I dont want to put it back together until its fixed. As it was I had a nasty weekend pulling the bottom end apart with the block still in car. Im not keen to do that again.

Cheers, Jason

[mattysshop]

AFAIK stem seals usually only leak in high vac situations, such as idle, or decelleration..

sure your oil control rings are good? you obviously replaced the rings when you pulled the pistons out and honed the bore??

when i had issues with a glazed bore on a fresh 16v 4AG i built (quads, with stock 16v map sensor ecu = RICH!) i had it ingest a full can of carby cleaner whilst at temperature idling.. and holding the throttle cable open.. a fair bit to keep her at about 2500rpm and started just filling it with a whole can of carby cleaner..

it's like one of those things your dad's mechanic tells you to do.. like jam banana peels in your diff to quieten it down lol..



having said that it did work!! very well!!

[essaysixtythree]

Yep has new rings but the oil control rings are the old ones. I got the rings from ebay and the oil control rings that came with the set were too thick to sit in the groove so i just left the old ones on there. They looked pretty healthy when I had a look at the pistons on the weekend. What should I be looking for? Carbon, oil residue? Is there a clearance that can be checked to see that they are in spec?
I assumed that since we had the engine idling for quite a while to getting it running right and hadnt put it under load straight away that the rings didnt bed in well. How does running carby cleaner through the motor help glazed bores?

Cheers, Jason