Maximum rev's available

[bayliss Thomas]

Just a little advise please, what is the magic number regarding RPM I can expect from my 123gt. The car is, as far as I'm aware, factory standard. It's not something that I am likely to explore, just curious.

[classicswede]

Should rev to just under 7k. I built engine can sustain extended periods of 8K

[bayliss Thomas]

WoW!!! that is a fair bit higher than I imagined, I will have a little exploration next time I'm out. Doubtful I will extend the old girl beyond 4500 rpm though.

[Ron Kwas]

bT;

I expect cs will have gone to different or double valvesprings as part of a build which will go past 6kRPMs...typically in stock engines, the Valves will float as springs run out of the ability to keep up with such a speed...its a self-limiting situation...I wouldn't spin a stock engine over 5.5k, but 4,5k it will do all day!

Cheers

[bayliss Thomas]

Thanks Ron, that's much more inline with my expectations, I like to run my lovely old cars over the years with a sympathetic right foot. But I was curious just how revvy the engine can be.

[Clan]

Originally Posted by bayliss Thomas

Thanks Ron, that's much more inline with my expectations, I like to run my lovely old cars over the years with a sympathetic right foot. But I was curious just how revvy the engine can be.

remember it will only be producing about 80 hp or less if you do not go over 4500 rpm ...

[bayliss Thomas]

Originally Posted by Clan

remember it will only be producing about 80 hp or less if you do not go over 4500 rpm ...

Although the fine cars have a rock solid reputation for solid build and longevity my habit for mechanical sympathy overrides exploration beyond 4.5 maybe slightly more rpm.
Having said that come the summer the old girl will be pressed into towing duties. I have a Romini mini caravan which I will be using at steam rallies and such like. As the Romini only weighs 375kg I am sure the 123 will take these duties in her stride.

[classicswede]

They are not a fragile engine and do like to be revved. They take short blasts of touching 7K in factory form but with a free flowing exhaust. If holding that or revving higher you need stronger valve springs. Revving to 6K is certainly no issues. Never giving them the odd burst of high revs seems to choke the engine up

[Steve121]

I happily took my B18 to 6500rpm, although slightly modified with uprated single valvesprings, k-cam, flowed head etc..

FYI my current 2.1 motor I took the bottom end for balancing, crank, flywheel, clutch cover, and except for the clutch cover everything was within their 'race' tolerance as standard, so good for 10000rpm they added a couple weights to the clutch cover.

[Volvo_133]

I used to "borrow" my Fathers 122S back in the seventies. I was 18, dad drove to work in rush hour traffic, I used it in the evening.
Often he would ask "what have you done to the car it runs a lot better".
I would say i had re gapped the points. I had done nothing other than give it some thrash. I bought my own Amazon aged 19 and have owned one most of the time since. As others have mentioned they do get clogged up and benefit from a hard drive.