9 replies to this topic

[incrediblerog]

Ok, it's just a quicky really, been driving around for a week or so with my new engine 286 scatter cammed 1275 with a tiny bit of head work and am looking to get the old girl rolling roaded on saturday before l2b. When the new engine was installed we discovered that the minisport manifold i've got is too long to fit my hif44 on so we made do with the hs4. Unfortunately the budget won't stretch to a new manifold and the RR. What i'm wondering is, is this carb capable of fueling this engine once set up or am i pushing it a bit? I don't really want the rolling road guy to laugh and refuse to do it. Cheers rog.

[Road Runner]

Have you tried looking in a scrap yard for an MG metro inlet manifold.

[incrediblerog]

Nope, unfortunately the original was misplaced a couple of years ago and i don't have the time to find and buy a replacement. Am i correct in thinking that the hif38 is a modernised hs4 with a central float chamber thingy ma jig? And that the hif44 was never actually fitted to mini engines?

[TOMMO0302]

HIF 38 means 38mm, HS4 means 4 1/8ths of an inch larger than 1" so basically yes they are the same size but the HIF has the integral float chamber and any other changes that went along with it.

I am unsure of whether the HS4 will be beefy enough but how come the HIF doesnt fit? I have an aftermarket manifold and HIF44 and its a bit tight but fits fine.

[incrediblerog]

I'm not entirely sure as to why it doesn't fit, my friend who built the engine tried to fit it when i wasn't there, it fits with out the spacer but the butterfly can't open and with the spacer on it fouls on the bulk head. Even after knocking up some custom short studs for the manifold/carb It's fairly tight as it is with the hs4 and airbox! I realise the 44 is going to be the better choice in the long run, but if i can get away with it i'll leave the small carb on there and vizardize the 44 for later!

[Guess-Works.com]

Save yourself some money and buy the correct inlet manifold first... If the butterfly is fouling then the inlet manifold is for a 1.1/5" carb, they can be eased out with a die grinder to 1.3/4"....

If you get the car tuned with the 1.5, then when you come to change the carb you will need to get the car re-tuned, so doubling the expense...

There's absolutely no point getting a car setup and then changing something...

[Road Runner]

I machined the spacer down a bit but the ID of the inlet on the manifold should be the same as the carb.

[incrediblerog]

Cheers for the replies folks, GW, I appreciate that once rolling roaded any changes will require another rolling road session, and more ££'s but really the engine is finished as far as i'm concerned. I'm not particularly fussy about the benefits between side mounted and integral float chambers and the other differences between hif and hs either, i just need to know if the hs4 can be set up to adequately fuel a 1275, so far it seems to be doing ok without being setting up (currently setup for a 998) but i'm no expert! lol I've got a hunch it is but don't want to look like a lemon when i get to the RR!

[Dan]

The HS equivalent of the HIF44 would be an HS6. The HIF44 was fitted as standard to any performance versions of the 1275 in Rover Coopers I believe. Maybe get yourself an HS6, clean it up and get it serviceable and keep it with you when you go to the rolling road. If the car needs it you can always swap it out quick enough and if not you can sell it afterwards.

Even though you aren't bothered by the subtle differences, the HIF is a much better instrument than the HS. For one thing you will get a lot better fuel consumption for the same power than with the HS if you fit an HIF.

Edited by Dan, 15 May 2007 - 02:58 PM.

[incrediblerog]

once again thanks for all the replies! it would seem that i'll just have to be patient and wait until i can address the manifold issue, might pick one up at l2b! and stick my 44 on before it gets the RR treatment. it's annoying enough idling at 1800 after the old girls warmed up to do something about it sharpish

the issue i have with my current manifold, is not so much that the butterfly is obstructed, it is the bit which the throttle cable attaches to which fouls on the outside of the manifold, and then with the spacer it makes the the whole assembly too long. i'm a bit surpised by this as i figured it would all just bolt on and that would be that! bloody minisport! lol