7 replies to this topic

[Jamie]

hi all,

i'm thinking of putting a swift tune sw5 cam into my 1275 spi.

Has anyone else done this and what sort of increase are you look at???

[biggav]

dpends what else you are doing/ have done to the engine. The cam controls the amount of time (and when) the valves are open but is a good starting point as you have to get the engine out to do it... most other head/exhaust/inlet mods can be done from the top without taking the engine out.

[Jamie]

the engine is having a full rebuild as the gearbox died.

I'm having the cylinders bore +20 with new pistons and rings, crankshaft reground with new bearings, duplex timing chain.

I'm having to change the camshaft just wanted to upgrade

[Big_Adam]

Ah, should be easy job with the engine out, just reamber to have the cam timed up right. You'll prob need an off set woodruff key for the crank. Unless your using adjustable timing gear.

[clubman katie B.F]

as big adam said...make sure the cam is timed properly......don't just line the dots up on the timing chain, use a cam protractor and lift gauges.

[Jamie]

this i've never really done before i've been watching the ulitmate mini builder DVD but its a little unclear.

Is there a guide anywhere that explains the timing process

[Big_Adam]

the manufacturer of the cam will give an off set for timing it up. Or if you buy direct from Kent or Piper cams then you can ask for the proper woodruff key. Then it's just a matter of timing dot to do as the key takes off set the crank enough. Doing it proper means breaking out the dial test indicator to check for TDC.

edit

don't forget new cam followers!

Edited by Big_Adam, 13 February 2007 - 07:50 PM.

[icklemini]

built an engine last year that was 1293 with the sw5 and a worked head - produced v good results.
the cam is great as a road cam - when setup with decent ignition and fuel the torque is great.

am doing a guide on cam timing for another forum at the mo - hope to get it finished soon :\

am building a 1380 at the mo, and using a phase 2 cam in that - bit hairier than the sw5, but the extra displacement will smooth it out hopefully yielding fantastic torque (as that what road engines are all about!!)

This cam will be great for you SPi...

the manufacturer of the cam will give an off set for timing it up. Or if you buy direct from Kent or Piper cams then you can ask for the proper woodruff key. Then it's just a matter of timing dot to do as the key takes off set the crank enough.

hmmm - they dont as every cam, and every timing sproket is different. therefore supplying a x offset key is just guessing. only way of doing it is with a dti and protractor...

ttfn,
Dave

Edited by icklemini, 14 February 2007 - 01:38 AM.