HOW FAST SHOULD IT GO?

[PAULJ]

1275 Ital engine, type 9 5 speed box, 4.2 diff and HIF 44 carb.
This seems to be the standard upgrade from what I have read on the forum. Maybe I'm expecting too much. If anyone else has this set up could they please let me know what top end they are getting. Also what nedle and main jet size they have. It would help if they could please tell me what there mixture screw setting is.
Many thanks
Paul

[bmcecosse]

You can't specify mixture screw like that !! Unless your engine has had a cam change and a big valve head fitted the HIF 44 is a bit of an overkill. Normal starting point for needle in that carb is BDL and all 44s have 100 jet....... It may be getting ~ 65 bhp if in good condition.

[Matt]

I would think you should get 90-100 ish flat out (aerodynamics of a brick!)

[PAULJ]

HIF44 is standard for an Ital, so how is it overkill. If other people have this set up then there mixture screw will be a good start point for me. Metro and Ital have the same carb but deferent needle. I don't know what cam, carb or top end is on the car. I have set it up as best I can without putting it on a krypton. I just wanted to know how fast it should go



Thanks matt for answering the question. That's what I would expect. Seems I'm a bit short of the mark

[jonathon]

With a strong 1275, you can reach 95-100mph

[PAULJ]

Thanks jonathon, thats prity much what matt said. Im getting 70 at a push ande maybe 80 down hill with the wind behind me. Thats on the sat nav not the speedo which is way out at the moment. More tweeking needed

[bmcecosse]

Your original question asked about 'top end' - nothing about top speed! As I said - it needs a cam swop and better head to make it a 'good' 1275! My 1098 does well into the fuel gauge - and that's on a dead accurate speedo, and on a 3.7 final drive. However - even a bog standard 1275 should manage a bit more than you are getting. Have you run a compression check to get a picture of the general condition of the engine ? I assume you are doing these test runs in (direct) 4th gear, not (overdrive) 5th? And - what needle is in the carb at the moment? And - what colour are the plugs after a good hard run ?

[PAULJ]

My question was what top end they are getting (speed) The clue is in the title. I can check the plugs, change the cam and play with the carb but If I dont know where im going how will I know when Im there?

[bmcecosse]

Engine out job to change the cam I'm afraid. I've pointed you in the correct direction - if you still don't know where you are going......... Still waiting to hear what needle is in the carb ? And - have you optimized the ignition timing, and is the vacuum advance working as it should ? Compression test result ?

[linearaudio]

Any 1098 Moggy should do better than 70ish, so your 1275 should be up on that unless it is poorly!
Do as Roy says and check the plug colour after a good run- that will tell a lot about the mixture. A good starting point is the little button under the carb piston. At tickover if the mixture is too rich then pressing the plunger will make the revs increase, too weak and it will die, a hesitancy usually is about right. Ignition timing should be advanced(turn distributor clockwise) until the engine pinks under load, then backed off a tad (universal measurement of approximity).
To avoid further confusion, I suggest in future you make the title of your post a bit clearer- maybe use a title like " how fast should it go?"

[bmcecosse]

That would be a waste of time - I never read titles - or assembly instructions for that matter!

[alainmoran]

I know of a morris with a standard 1098 engine which will easily do 80, it may do more but the owner doesn't want to push it any harder.

[bmcecosse]

Some basic 1275 engines were only rated at 50 bhp - ie hardly any better than the 1098 at 48. I don't know if that 'basic' engine was ever fitted in the Marina/Ital, although I rather doubt it since it was rather a heavier car than the Mini!