Weber carb vs SU

Asked by Feb 09, 2014 at 02:26 PM about the 1979 Triumph Spitfire

Question type: Maintenance & Repair

I need to rebuild my SU carb for my 79 Spitfire and I do have the rebuild kit. Like any that has not been taken apart before, there are always surprises. I even bought a new manual on carbs to help me out.
However, I was wonder if it would be worth it to invest in the Weber Carb and just get rid of the SU? Anyone have any experience in this process?

1 Answer

50

I have setup twin weber 45's on a 2.0l race alfa nord engine - thirstier and plenty of power, if tuned properly. Webers tend to require long intake manifolds & are infinitely tuneable, good even compression on all cylinders gives best results. SU HS 4& 6 twins not as much flow but very forgiving and provide smooth torquey power, in the great triumph engines also ridiculously fuel efficient. Where most power counts 4000-4500 SU delivers. Stick to SU's would be my advice unless racing & flat out. I have them on my current 2500s & have had them on a lumpy cam 2.7 working good too good for 165-175hp. Sure you need to rebuild them? check the piston is not sticking, if OK just tune in the needles - once no need to always be fiddling with SU's. if your SU are truly stuffed consider mikunis from v-performance before webers.

2 of 2 people found this helpful.

Your Answer

Add photo

Related Questions

Search Triumph Spitfire Questions

Triumph Spitfire Experts

#1 Peter Adams
Peter Adams
Reputation 100
#2 Js08016
Js08016
Reputation 90
#3 jamnblues
jamnblues
Reputation 70
View All

Related Models For Sale

Used MG MGB
67 listings
Used Ford Mustang
461 Great Deals out of 45,641 listings starting at $1,999
Used Triumph TR7
5 listings
Used Chevrolet Corvette
121 Great Deals out of 20,599 listings starting at $3,000
Used Porsche 911
81 Great Deals out of 4,454 listings starting at $9,995
Used FIAT 124 Spider
1,394 listings starting at $20,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.