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 Posted: Aug 3, 2017 03:07PM
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a pair of HS4s is a lot of carb for an A series used on the street, and the benefits only really come on at WOT because the air moves too slowly otherwise

if you want to increase your power/torque in the working range, you could get it by fitting a pair of HS2s or a single HIF44/HS6 (and save changing the cam until next time you need to pull or rebuild the engine), to keep the air speed up for max torque

 Posted: Aug 3, 2017 12:24PM
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US
Thanks for everyones input Steve

 Posted: Aug 3, 2017 10:58AM
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GB
Quote:
Originally Posted by Spank
VP3 and 286 are designed for similar performance rev ranges. If you don't like were the vp3 comes on, then don't go with a 286.

In fact, the 286SP (Scatter pattern) is the same as the SPVP3, according to Vizard
Funny that, as he designed both of them afaik.

 Posted: Aug 3, 2017 04:13AM
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US
Cam selection has always been a bag of worms for me. I have read just about everything I can find about the subject. I recently rebuilt an 850 using a MG Metro cam. First couple of runs on test stand had me concerned I'd gone to far on cam. Reworking the dizzy advance curve and finding the proper timing for this engine sorted off idle issues. 

I run a SW 5 type cam in my 1360 cc single HIF 44, MG Metro cyl head mildly ported, MPI cast LCB exhaust with my own exhaust system. I also run a wide ratio gear set with 2.76 CWP with two O/D drops for a 2.56 finial drive. It pulls from 1500 to about 5000. 

I'm assembling a 1293 with a MDM 276 Kent and a 3.76 CWP. Also have a 1400 cc in the works with big valve head, all Vizard work claims a 286 is the solution. Seems valve size limit is a problem for these big engines. 

My race engines rev into the high 8s, Working on collecting parts for a new autocross power unit. I plan to use a ST 643 / 544 cam. I believe Kent makes a new blank copy. 

As I have matured it would be hard to build a duel purpose power unit for a mini. So much of my driving now is high speed highway. We suffered with 55 mph speed limits for years. Autocross gearing was fine. Now I take the kids to school at mid to high 70s (HOV) 70 at 3000 is fine just before wind noise goes off the charts. Steve (CTR)

 Posted: Aug 3, 2017 12:15AM
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GB

Piper 255 or 270.

The SW5 is also good.

 Posted: Aug 2, 2017 09:59PM
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VP3 and 286 are designed for similar performance rev ranges. If you don't like were the vp3 comes on, then don't go with a 286.

In fact, the 286SP (Scatter pattern) is the same as the SPVP3, according to Vizard

 Posted: Aug 2, 2017 08:28PM
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US
See CAM103 on this site.

 Posted: Aug 2, 2017 06:28PM
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CA
Look at Swiftune SW5s and follow-ons for a cam that will deliver a strong torque curve in the rpm range of your 'normal' driving.  My 1380 with SW5 performed admirably, even with 2.95:1 FD.  

 Posted: Aug 2, 2017 04:55PM
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Looking to freshen up a 20 year old build this fall. Currently running longman big valve head, 1.5 to 1 ms rockers, 10.5 compression. Vp3 cam. ST manifold and twin 1.5 SU. Everything is lightened and balanced. Engine runs strong particularly above 4000 rpm. Since I will be using this primarily for street and occasional auto cross I would like to change the cam for something with a little more mid range torque. I so far have heard the evolution cam 001, Kent 286 would be a good fit for my build. Any suggestions?