73 replies to this topic

[FastEHHolden]

Ok...EGR mixes 15% of the exhaust gas with the inlet air reducing the formation of Oxides of Nitrogen AT CRUISE ONLY...it doesn't work at full throttle..therefore not reducing the performance....its all in the details.


No you can't fit hollies ect unless you can plumb it up to your emission controls and be able to prove it works....but there are carb choices out there instead of Holleys. WW Stromberg, Varijets and ADM 34 webers are 3 very good replacements for single strommies on red sixes...on V8 a WW strommy for a 253 or quaddy for a 308...heck ..quaddy on a 253 if its enough.

By the letter of the law you can't change cams..but cams wear out..and there isn't any real way for them to prove what cam you have anyway.

[FastEHHolden]

It wasn't that the pollution controls were to blame...more likely the band aid solutions applied by the engineers of the time.

[rodomo]

Shhhhhhhhhhhh, dont tell anyone, son's UC had a bypass operation today.
RACV MAN

[Tiny]

My opinion is that if your stuck with a prollution controlled car.. the easiest ( but by no means th cheapest) way to "get around it" is to fit a good aftermarket EFI system. EFI really allows infinite tuning capability as well as being able to get the car under the pollution limits.

That would be my option if i had to abide by it all Thankfully mine's a 1972 HQ, and a 4/76 SLR! Charcoal cannister i'm happy with ( i think i really SHOULD put one or two on the HQ... but i just dont want to!).

Cheers.

[FastEHHolden]

My recommended way to get around it is to fit a gas system....no charcaol canister, egr.
still gotta run PCV

[surfmaster]

Interesting, never actually read about the LX SL/R 5000, and dunno if anybody has mentioned it here. They upped the compression from 9:1 to 9.7:1 to compensate for the anti-pollution gear. Things ya learn when you read.

Wonder if this was across the range, i.e. 202's included?

Not sure Yella if it was across the range, but before it came it we got the big scare tactics about how bad it was going to be........and they ( the qualified guys) weren't far wrong, the bloody things ran like hairy goats, you could not (yeah) take the plug out of the idle mixture screw to adjust the mixture or do anything else that was not according to Hoyle. (Who the hell is Hoyle anyway???)

My preference would be to:

a) buy a pre 27a vehicle (not easy to do)
put a later blue motor in, still a lot of plumbing but it basically fits and the Varijet Carby was light years ahead of the strangulated single strommy.

[surfmaster]

As far as I know, Hoyle wrote the rules of Poker / card games happy to be corrected on this!

Cheers
Herne

You know Herne I think you may have something there, what the hell was he doing down a 27a carby?

[Dr Terry]

Hi Guys.

Yella SLuR said.

'Interesting, never actually read about the LX SL/R 5000, and dunno if anybody has mentioned it here. They upped the compression from 9:1 to 9.7:1 to compensate for the anti-pollution gear. Things ya learn when you read.

Wonder if this was across the range, i.e. 202's included?'

This isn't quite correct, the increase from 9.0 to 9.7 compression only occured in the 308/5 litre V8 & was introduced a long time before the ADR27A anti-pollution laws (1/7/76). This info is very difficult to find in GM-H literature & I would be glad to be proved wrong if that is the case.

Most people believe that the 308 in a stock LH SLR/5000 produced 240 kW because that's what sales brochures say. Fact is, that's what the early '74 cars produced but in late '74 at the release of the HJ, the LH Torana 308 was upgaded to HJ specs. This happened at engine number HT24413 and was the result of smaller dished pistons (9.7) & new camshaft timing (advanced by 5 degrees). You only had to drive an HQ & HJ 5 litre of equivalent spec to feel the difference. I'd be admitting my age if I told you how many of these cars I drove when they were new.

Dr Terry.