13 replies to this topic

[johnnysti]

Hi all

im going to sell my ali manifold from my weber 45. Its 5" and i want to change it to a maniflow steel one.
The only thing is what length to get? Is it better the longer it is?

[robson]

as a general rule but im pretty sure V said that after 6 inches or so (cant remember exact number), it makes no difference, its just the short ones which produce not as good results.

[Jimmyarm]

as a general rule but im pretty sure V said that after 6 inches or so (cant remember exact number), it makes no difference, its just the short ones which produce not as good results.

Thats funny, its what my girlfriend said about something else too

[robson]

lol

[Jimmyarm]

This thread is great, I just noticed;

The only thing is what length to get? Is it better the longer it is?

[robson]

for 'people like you'

[Jammy]

Ok Jimmy....

If you get the bigger ones you'll need a box to put it in!

[fikus01]

webbver length i believe ideal length was 11 inches but its not practical in a mini so 6 inches is good. also worth noting the bigger the box the better as it gets more air round the carb and leaves more room for any leaking fuel to escape and evaporate without it being in a small space!! thats never good!!

[Jimmyarm]

i believe ideal length was 11 inches but its not practical in a mini so 6 inches is good

Absolute quality

[fikus01]

believe ideal length was 11 inches but its not practical in a mini so 6 inches is good


Absolute quality

and as for manifold length

Edited by fikus01, 11 January 2007 - 05:43 PM.

[Alburglar]

I believe 7 inches is supposed to be the best comprimise in a mini, but apparently (according to swifty) the straight 3inch steel maniflow manifolds from minispares work pretty well.

[fikus01]

7 INCHES PUTS THE AIR FILTER AT THE OTHER SIDE OF A STANDARD DASH!!

my airbox is about as big as u can go without going past the original dash lines, i have 6" manifold and a 60mm filter with 40mm ram pipes and its got 1cm behind the air filter before it gets the back of the box!! i gues you could use shorter ram pipes and filter but how much restriction would u get??

iremember reading in the vizard bible if the manifold is too short the air pressure waves can blow fuel back out of the carb rather than into it so at low revs you'd actually run lean!!

[nikilah]

i was always told its not the length but the quality of the action.

[edjohnson]

7 INCHES PUTS THE AIR FILTER AT THE OTHER SIDE OF A STANDARD DASH!!

My uncle had a webber that came into the cabin, moved the clocks to accomodate it.

he reckons if it back fired on the overrun, and it werent set right, you could easily get flames scorching your elbows!!!!