modifying the intake trumpets - Defender Source
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  #1  
Old October 15th, 2011, 11:48 PM
cdb
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Clark Bowen
1969 Series 2a/OM617 Bugeye 88"
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modifying the intake trumpets

Has anyone modified - shortened and/or polished - the intake trumpets?
Did it make any difference - good or bad?
What did you use for a reference for cutting?
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  #2  
Old October 16th, 2011, 09:45 AM
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Bill Adams
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Short runners equal higher rpm power, longer runners equal low end power. Your choice. You need a pile of trumpets and a dyno.
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Old October 16th, 2011, 09:52 AM
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or the book-Tuning The Rover V8. Benefit from the work/trial and error already done


http://www.amazon.com/Tuning-Rover-V.../dp/0854299335
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  #4  
Old October 16th, 2011, 10:22 AM
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James Pierce Jr.
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Wow! $945 for a rover book. Thats a pretty good down payment on a TDI
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  #5  
Old October 16th, 2011, 01:29 PM
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Clark Bowen
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I was looking at that Amazon listing a few days ago, but was relieved that I could find one in good condition from a seller with a 94% rating for only $102. Oh boy!
The $945 issue comes from Germany, so figure shipping and import duties too.
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  #6  
Old October 16th, 2011, 05:18 PM
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Jake K.
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Quote:
Originally Posted by cdb View Post
Has anyone modified - shortened and/or polished - the intake trumpets?
Did it make any difference - good or bad?
What did you use for a reference for cutting?
3/4in is the happy # for what you want to cut off if you are not going to do anything else. You know that wall you hit when you are getting into it...just like there is no more power? If you do this modification right you lose that wall and you revs just seem to keep going...like your power-band is extended. Don't cut any more or any less unless you are doing other mods. I've done about 50+ sets now with great response. Good luck
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Old October 16th, 2011, 11:36 PM
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Clark Bowen
1969 Series 2a/OM617 Bugeye 88"
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Thanks Jake.......

This sounds like it is worth doing.
Any downside to the mod?

Clark
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  #8  
Old October 17th, 2011, 05:37 AM
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Did the following on my '88 Range Rover (which had a 94 disco motor in it.)
Shortened Intake Trumpets
Roller timing chain
Crane Cam and lifters
New fuel pressure regulator (increased the fuel)

The motor was a BEAST...it made a significant difference....will do the same to my 90 soon.
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  #9  
Old October 17th, 2011, 07:42 PM
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Clark Bowen
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Dave...

With the cam, etc. did you also cut 3/4" off the trumpets or did you use a different length?
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  #10  
Old October 18th, 2011, 11:43 AM
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Dave Sherwood
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Quote:
Originally Posted by cdb View Post
Dave...

With the cam, etc. did you also cut 3/4" off the trumpets or did you use a different length?

Not sure...my checkbook did all of the work :-)

I will ask my mechanic next time I talk to him....
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2016 RRS

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1997 Disco I
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