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Cam recommendation, please!

Dr_C

Dr_C

Joined Oct 2003
955 Posts | 1K+
Sweden
As my no1 engine blew up at the Dyno last Monday a have to use my spare engine for the practice next Monday. There is a 2004-piston in it (the concave shaped dome). I have no experience with using the lower compression ratio that piston gives. If I remember correct it was around less than 12,5:1? I have the #08, #53 and #62 OEM cams to choose from. The #62 has more overlap and duration, and has been my favourite pick for a long time. The #08 lets the intake close a little later, giving a more rev friendly character. The #53 seemed to fit something from the mining industry, or perhaps a freight train...

So,
-will the #08 cam together with 12,5 be too weak in torque but let me use the gearbox to compensate?
-will the #53 fit the lower compression better

Any ideas?
 
you should pick the cam before the compresson. plus 12.5:1 is claimed. it will be less than that. the #62 should have better cylinder filling properties bumping the compression back up.

my duke ran a nepoti and caracci racing cam and it had huge ovelap but same lift, it revved forever but wasn't so strong at low revs. in the end i'm not so sure it was quicker than the 'tractor cam'.

so i guess if i was riding a small tight track i might consider that '53'!

just a guess mate coz i don't have the figures! i checked the timing on my WR400 (YZ re-timed cams) against the husey and the yam's inlets staryed open another 35 degrees. massive difference!

we had a katoom rider join here for one day about 3 months ago. came, saw, went. mentioned though, about 2 katoom cams and what he liked about them. well worth looking for that in a search as they can be madetoit easily.

katoom use a cams called:

5521
8/06

try those in a search - you might find it. he was worse than a BW, he was a FT!!!!!!!!!!!!! (LOL!!!!)

regards

Taffy
 
I need to catch up with the lingo! :)

I don´t have the figures here, but I think a flat (01-03) piston was somewhere 11,7 and the concave slightly higher. The 470-piston was 13,5-13,7, which I normally use together with the #62. I made some mistake while indikating the cams (bump in the intake curve for the #62), but diagram is attached anyway. The difference in max lift comes from being measured in my billet cylinder head or in a stock cylinder head.

I´ll check on the cams! Thanks for the tip, Taffy!

What´s Katoom? A team or a manufacturer?
 

Attachments

  • Husaberg cams.pdf
    33.5 KB
a katoom is an orange prick! work it out you silly bugger!

indikating? is that indexing? your english is 99% spot-on but that may have caught you!

also you say a flat piston had 11.7:1 but CONCAVE had 13.5:1. this is double dutch mate. the only way a piston can have a higher compression than a flat pistion is to have a CONVEX CROWN.

i usd to measure my actual compression. it's really quite easy.

regards

Taffy
 
I´ll have to get back on the Katoom-thing... And when I do, take cover!
Indexing is the word! Thanks!
But you have to use your spectacles! 13,5 with a concave piston? Read my post again or get a good nights sleep! :D
I measure compression allways, but due to my PTFE-memory...
 
of course i do have the numbers for those cams but i can't imagine anyone out there would want them?

tum-te-tum......!!!!!

regards

Taffy
 
O, Taffy Allmighty,
please bless us with a fragment your extensive all-there-is-to-know-about-husaberg-and-everything-that-slightly-reminds-of-a-Husaberg! In particular timing data from the orange prick cams.. They have one "112" that is very similar to my #62.
 
Today I put together engine #2 with a 2004-piston (12,7:1) and the tractor cam (#53). The head has stock valve sizes (37/30mm), but a new porting philosophy. Still the same 50mm Lectron carb. I´ll fire it up tomorrow and on Monday evening is the first practice of the season. I´ll bet the power band will be like the anchor machinery of Queen Elisabeth II. We´ll see.
 
the 450 had two grinds:

5521
intake 232d duration at 1mm lift
exhaust 222d at 1mm lift
intake 8.56mm total lift 320d duration at .006" and 220d duration at .050 (thou?) 138d duration at .200
exhaust 8.41mm total lift for 308d duration at .006" and 208d duration at .050 and 130d duration at .200

the 5521 is said to be better for bottom end.

8/06 cam has better top and the owner commplained of a hesitation at the bottom. i had this and all that was needed was an open tailpipe and it was cured.

so:
8/06 intake 246d duration at 1mm lift
exhaust 240d duration at 1mm lift
intake 9.12mm lift at 338d duration and .006. 234d duratiion at .050 and 150d at .200
exhaust 8.89mm lift and 320d duration at .006 and 228d duration at .050 and 146d at .200

now i bet you feel a whole lot better for knowing all that donchya!

these numbers are from 2 years ago and i've just sat on them. i would think something else has come along since...

regards

Taffy
 
Yes, now I feel better! Not sure whether it was the actual information, or coming across such helpful and dedicated people... Thank you, Sir!

Those cams do not appear like something I desperately need to try out. I took my RR for a test ride this afternoon. It was revving up to 8500-9000rpm with the #53-cam! Not with the usual roar after 7k, but still. Tomorrows training will be interesting.
 
Yesterdays practice was fun! The #2 engine wasn´t pulling as strong as #1 used to, but it breathed freely up to and beyond 9k. And that with a #53 cam inside! 8O
The only conclusion I can make out of that is that intake/exhaust design and ignition timing, also are playing major roles in the power characteristics.
 

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