trumpet lengths
Started by
_uglybob_
, Jun 07 2006 07:23 PM
9 replies to this topic
#1
_uglybob_
_uglybob_
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Posted 07 June 2006 - 07:23 PM
hey guys i was looking to get some trumpets for my su's but realised that there are differnt lengths you can get. does it make much differnce if they are short or long?? if so what happens if they are too long?? or even can they be too long?? whats the go?
#2
_draglc_
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Posted 07 June 2006 - 08:31 PM
shorter.. more torque, longer higher revs.. i think 
I got medium size ones on mine, actually theyre modified weber trumpets, with a nice curled edge. Probably about 3-4" long. Got my engine from 151rwhp to 163rwhp, so they do make a difference!
A1
I got medium size ones on mine, actually theyre modified weber trumpets, with a nice curled edge. Probably about 3-4" long. Got my engine from 151rwhp to 163rwhp, so they do make a difference!
A1
#3
_uglybob_
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Posted 07 June 2006 - 08:41 PM
thats awsome cheers for that A1 i guess ill just go for the same length as you then mate
cheers
ben
cheers
ben
#4
_torana_
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Posted 07 June 2006 - 08:54 PM
trumpet lengths have allot to do with air speed into your carbies ( the longer the trumpets the more time the air is running straight so it can accelerate more, the upside is this only happens at high revs ) You really need to talk to an expert to work out what rev range you want to run your car at, and decide on a length from there. Even better borrow a few sets and do a dyno run to look at the different effects.
Years ago toyota or honda was toying around with automatically adjusting trumpet lengths to revs to try and get the optimal length tune over the whole engine range.
Hope this helps
cheers julian
Years ago toyota or honda was toying around with automatically adjusting trumpet lengths to revs to try and get the optimal length tune over the whole engine range.
Hope this helps
cheers julian
#5
_draglc_
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Posted 07 June 2006 - 09:01 PM
u can get short ones or long ones, but for good all round performance, the medium size ones are best.
A1
A1
#6
_uglybob_
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Posted 07 June 2006 - 10:07 PM
cheers guys i might ask the dyno tuning place if they would do that for me. so does that mean if i get huge long ones and im just tokin around itll run crappy?
#7
Litre8
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Posted 07 June 2006 - 11:04 PM
Generally longer rams tubes tend to enhance mid range torque with perhaps a little loss of power at top end. Shorter rams tubes would produce the opposite effect.
#8
_devilsadvocate_
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Posted 08 June 2006 - 11:37 AM
Id imagine that a fast flowing air stream past them would change their effect quite a lot?
#9
Litre8
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Thrillseeker
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Posted 08 June 2006 - 12:32 PM
Very likely but under a bonnet with air filters that effect would be much reduced.
#10
makka
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A m��se once bit my sister
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Posted 08 June 2006 - 01:57 PM
I think that I worked out that around 12 to 17 inches is the ideal intake length.
thats measured from the intake valve face to the end of the trumpet, I cant remember, it was a while ago
thats measured from the intake valve face to the end of the trumpet, I cant remember, it was a while ago
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