Which cam for Dunstall 810

apart from Dunstalls own cams. 3" radius tappets.

seems a Megacycle 560-00 or a Stage 1 JS motorsport is the go for 3" radius lifters.

Seems like you answered your ouw question, when I built my 850 for the Featherbed i went for the SS cam same as the 2S cam as other say and my Norton runs so well with that cam profile, pulls like a train and is well behaved on the road at slower revs and revs out to well over 7,000 rpms and will rev to well over 120 MPH and will keep reving, I think Dunstall cams did the same, I run mine with the stock followers and works great for my Norton, as you be awere the Dunstals had a few problems in their days, but mostly with the cylinders.

Ashley

thanks, I'm aware of the problems with Dunstall cylinders, I hope we can stay away from that in this thread.
so unless I can be convinced otherwise it will be one of the two cams (nearly the same).

I had what was supposed to be a Dunstall racing cam in my 650SS. It lasted about 4,500 miles. Flat as a tack under 4,000 rpm, like a rocket ship over that, up to a (police registered!!) 120+ mph. When it wore out it was replaced with a 2S cam which was excellent, no peaky bits in the power delivery, nice and smooth, up to about 115mph. I know what I would use on a road bike!
cheers
wakeup

ashman said:

Seems like you answered your ouw question, when I built my 850 for the Featherbed i went for the SS cam same as the 2S cam as other say and my Norton runs so well with that cam profile, pulls like a train and is well behaved on the road at slower revs and revs out to well over 7,000 rpms and will rev to well over 120 MPH and will keep reving, I think Dunstall cams did the same, I run mine with the stock followers and works great for my Norton, as you be awere the Dunstals had a few problems in their days, but mostly with the cylinders.

Ashley

Click to expand...

This will only work if the cam lobes ( by that I mean any make of camshaft) are 100% accurate, or pretty dam close. The Dunstall camshaft I purchased from Dunstall was pathetic, only one lobe was spot on as per the timing sheet; the other three were as much as 11 degrees out :shock:

I'm pleased to read someone else finds the 2S cam character power band so pleasing. Increasing displacement with same cam tends to tame cam for starts, idle and comming on cam a bit lower in rpms. Can degree cam to suit use a bit better too. After seeing my own flattened cam lobes from hi rpm flings I'd sure want to have a new one cryo tempered then nitridied polished. Factory springs can't control factory valves much into red zone if immature enough to do that to yours.

I use 2s cam with combat head.
Piero

Peel used 2S cam with standard 28.5 mm ports and freaked me out on the better response than hogged out Combat head with Dreer valve kit - till rather past red zone, it definitly catches a second wind. I changed heads to ride both the same day w/o changing anything else. So might be happiest with 2S cam and shaved standard head - if exhaust opened up enough wooweepeepee. Dynodave beat everyone a decade ago on dyno test at a INOA rally, reporting with a deserved grin it was done by 2S cam and small port head. Trixie apart for re sealing and thinking to put back like Peel set up to double check the combo then pretty quickly take her back to normal as way too tempting to use on un-tamed isolastics and not factory but would confrim worth spending to put actual Peel engine back together to use in something non Commando that needs hi torque to weight like a boat or wheelie pulling tyke.