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Post by roblee on Jul 10, 2007 21:23:05 GMT
which carb is a better carb to have in terms of setting up and perfomance. is it the HIF or the older ones. im swaying towards the older ones due to simplicity. thoughts??
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Post by Simon1275mpi on Jul 11, 2007 8:37:00 GMT
Injection!!! Get an emerald ECU or fit a megajolt!! ;D I can here jerring already  But the first question is what engine do you have? A standard 998 or 1275? As a very rough guide..... Standard 998 - 1 1/4" SU Pepped up 998 - Twin SU 1 1/4" SU Standard 1275 - 1 3/4" SU or HIFF 38. Pepped up 998 - HIFF 48 or Twin SU 1 1/2" SU There are so many options, as a rule of thumb, the airflow through the carb needs to be a good speed, so slapping a full webber system onto a standard 998 would not work, the 998 would not pull the air through the carb fast enough to be effective. Massive webbers work well on a overbored 1275 and high revs and full throttle. Define your engine spec and then your can find the best carb for the job. Your engine is the performance, the carb just feeds the fuel and air ready to burn. |
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Post by oldgit on Jul 11, 2007 9:51:38 GMT
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Post by Stephen on Jul 11, 2007 12:17:14 GMT
stick with an 1" 1/2 on a 998 or twin 1" 1/4s
single 1" 1/4 is only realy enough for an 850
1"3/4 or twin 1" 1/2s for a 1275
thats my advice anyway
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Post by monkeyjim on Jul 11, 2007 19:44:56 GMT
I agree with Jim
His has been built by a pro .
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Post by Simon1275mpi on Jul 11, 2007 20:00:14 GMT
I agree with all those reccomendations, but my point stands.
Define the engine spec, then pick a carb to suit its engine capabilty and your driving style (daily drive, weekend warrior or track day special)
Chatting to a professional like Gerald Dale would be best.
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Post by oldgit on Jul 11, 2007 20:07:25 GMT
which carb is a better carb to have in terms of setting up and perfomance. is it the HIF or the older ones. im swaying towards the older ones due to simplicity. thoughts?? [As yours is a slightly moded 1275 |
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Post by Simon1275mpi on Jul 11, 2007 20:27:24 GMT
As yours is a slightly moded 1275 Please Read post's   Having troubles with the quote function old man Thats a big assumtion you've made. Spotted on noted. 'Slightly modded'....... what with a 1275 bike engine? Guess you've got the inside information. Define the spec, then the carb. ;D |
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Post by MiniGT5 on Jul 11, 2007 20:36:01 GMT
Just to complicate things isint the HIF 44 the same as a HS6 (1 1/4") accept the HS is imperial and has the float chamber on the side, and isint the HIF 38 same as HS4 etc. etc. If possible i would go for the metro version the HIF as it is a more modern design and has no external float chamer  Anyway just my 2p's worth N :-) |
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Post by oldgit on Jul 11, 2007 20:38:17 GMT
No inside info I just listen to peps when they talk to me and dont woffall on about insertions all the time. UP YOURS |
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Post by Simon1275mpi on Jul 11, 2007 20:40:48 GMT
 Sorry mate I see its gone past the water shed
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Post by oldgit on Jul 11, 2007 20:47:23 GMT
Do you mean the by pass hose?
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Post by monkeyjim on Jul 11, 2007 20:50:37 GMT
Hiff 44 same as HS6 (1 1/4) Plonkers ;D Get a straight answer from Gerald Dale 01424 893903 |
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Post by MiniGT5 on Jul 12, 2007 4:43:56 GMT
Ops sorry that should be: - HIF44 = HS6 1 3/4 HIF38 = HS4 1 1/4 HIF44: -  Twin HS6: -  Both are the same size diameter just the HIF is metric of a Metro or Rover Cooper the HS is older and imperial and has that float chamber on the outside. N :-) |
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Post by MiniGT5 on Jul 12, 2007 4:47:13 GMT
Ops just noticed the pics are taken from differnet sides but they essentally use the same manifold too it just the HS only uses the 2 diagonal bolts and the HIF uses all four.
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Sorry mate