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weslake cams 11 #207810
11/11/07 8:00 pm
11/11/07 8:00 pm
Joined: May 2007
Posts: 52
co.down n.ireland
glastrywhippet Offline OP
BritBike Forum member
glastrywhippet  Offline OP
BritBike Forum member

Joined: May 2007
Posts: 52
co.down n.ireland
hi i am looking for help on cam choices for my weslake..have a 88.5mm stroke nre engine with either pac or corillo steel rods running puma cylinders at 81mm bore 913cc. I hope to get good power for short circuit tarmac racing with 4 speed cr triumph box ratios 1.69,1.3.1.1.1.0 have a present 305 cams, this gives massive torque and mid range but as posted previously it all stops at 6-6200, anyone tried 320's and z profiles or others in big engines.
Currently i am running lowish cr 9.5 can increase this but want to keep revs reasonable for reliability ...any experience welcome.


rickman trident racer
dresda t140 racer
1956 matchless g80cs
1960 matchless g2csr (wifies)
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Re: weslake cams 11 #207811
11/14/07 12:27 pm
11/14/07 12:27 pm
Joined: Aug 2007
Posts: 52
UK
Britbiker1234 Offline
BritBike Forum member
Britbiker1234  Offline
BritBike Forum member

Joined: Aug 2007
Posts: 52
UK
Hi, sorry I can't realy help you with this other than to suggest you try a "bigger cam" and see. What RPM do you want to rev to? What advice on cam's have Nourish given? However, maybe you could help me. Do you have the timing figures for the z cam? Maybe I should ask Nourish! Hope you get some more useful info. P.S. what crank layout are you running 180/360 or other?

Re: weslake cams 11 #207812
11/14/07 5:28 pm
11/14/07 5:28 pm
Joined: May 2007
Posts: 52
co.down n.ireland
glastrywhippet Offline OP
BritBike Forum member
glastrywhippet  Offline OP
BritBike Forum member

Joined: May 2007
Posts: 52
co.down n.ireland
yea thats what i decided engine is coming out upping compression to 10.75 and fitting 320 or z depending upon advice from dave nourish will post various dyno stuff when done...z cams are sta with centre line averages at 102 deg on both cams, can post daves instructions if you like.
on a std triumph bottom end be careful as the eight valve, followers are at a different angle to stock and will not time up on std marks...


rickman trident racer
dresda t140 racer
1956 matchless g80cs
1960 matchless g2csr (wifies)
Re: weslake cams 11 #207813
11/15/07 7:47 pm
11/15/07 7:47 pm
Joined: Aug 2007
Posts: 52
UK
Britbiker1234 Offline
BritBike Forum member
Britbiker1234  Offline
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Joined: Aug 2007
Posts: 52
UK
Yes, please post them, if that's ok. Got a similar profile T140 on some cam's for a 500 unit and haven't built it up yet to see what I've got. They look to have a long duration and loads of lift compared to std.

Re: weslake cams 11 #207814
11/19/07 8:17 am
11/19/07 8:17 am
Joined: Aug 2001
Posts: 1,081
Cheshire UK
Phatt Bob Offline
BritBike Forum member
Phatt Bob  Offline
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Joined: Aug 2001
Posts: 1,081
Cheshire UK
Hi B's B B...
I had some actual T140 cams in a unit 500 engine I ran a year or so ago (needed a bit of work to make them fit!). It went very well. It was at an early stage of development and ran low 14s and topped out at 112 mph. Rather than use the T140 or Z cam timing, I clocked them up and they were similar to Megacycle 512-30s, so I used Megacycle's timing figures of 103.5 peak. Didn't pursue it any further as I missed bic ccs, so sold it and built an 850 Weslake (alright, mostly Nourish).
I too have opted for Z cams.
I don't know if it was just down to development or the actual cams, but when I ran Zs in a similar 850 Weslake Triton, I was slightly faster over the 1/4 when I later changed to Megacycles.

The Zs I've run this year on a nominal 11:1 CR are looking good so far with 12.2 quarters and a top flying kilo speed of 139. More to come over the 1/4 when I manage to do the quick 60 foot launches at the same time as the fast gear changes, which didn't happen this season.

Regards

Bob


Phatt Bob
'95 Daytona 1200
'98 Daytona 1200 dragbike
ex-850 T140 Caff Racer, 850 Triton, Morgo T120, Starfire and Pretend Daytona 500 owner
Re: weslake cams 11 #207815
11/19/07 1:03 pm
11/19/07 1:03 pm
Joined: May 2007
Posts: 52
co.down n.ireland
glastrywhippet Offline OP
BritBike Forum member
glastrywhippet  Offline OP
BritBike Forum member

Joined: May 2007
Posts: 52
co.down n.ireland
thanks bob, i am raising compression to 10.75 ish reducing carb bore from 38 to 36 and changing first gear lower to 2.04 in a hope to help clutch and get better hairpin/start acceleration then use the torque up to a high close ratio 2nd 3rd 4th our tracks are shortish 1.5 and 1.8 miles. if this does not work i ll then fit longer duration cams and a 5 speed box will post dyno figs and any feedback...gw


rickman trident racer
dresda t140 racer
1956 matchless g80cs
1960 matchless g2csr (wifies)

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