What are some opinions on the two of these cams in a 120r motor? Thinking about building one of these motors up and running either of these cams. I want killer stump pulling torque down low in the power band (below 4000 rpm). This engine is 10.5:1 comp and plan on keeping it there. any real world experience on these cams? I have read ALL the other 120r threads already so no need to post links to them or tell me to do a search. Just wondering if anyone has ACTUAL experience with these cams.

 

You would be surprised how well that TW8 you have would work in that motor for what you want. Better have a clutch solution on hand and something that adds friction area and pressure not just the VPC.

 

Just last week I speced a 120r with a 662 tman bump the comp up about 10.8 or 11.1
And My New Dragula step header 2:1 EXHAUST will support up to 110/ 280 hp and 200/350 with baffle change.
2 year warranty
3 step header ceramic coat inside out 2mls thick each side=4mls
4.05 can 3.00 baffle or 3.50 baffle
This pipe is bigger than a Boarzilla.

I have seen what the woods 408-6 cam does against a Tman 666-2 Built blower motor. We have done one of each.

The Woods flat lined on us. The Tman 666-2 kept going with more rpm.
They are not the same cam.
Now these are Built motors with Blowers on them. Cant speak for Built motor with out a blower side by side comp.

Both Woods or Tman cams would work very well for this build. But again they are not the same cam.

TW408-6
24 /44 248 650 .218
46 /22 248 650 .200



TMAN Cams 662-2
23/51 254 660 215 104 105 45overlap
54/22 256 660 202 106

 

Frank,
I believe that he is refering to the 662-1.
23/45 .660 248
49/21 .660 250
Both will work well.
Scott

 

Your right my bad!!!!!!!!!!!!!!!!!!! Sorry My heads up my A%^&* this morning!!!!! LOL

We ran this cam in a 98 inch Built bike with blower it made 170 hp..

I think you would like the 662-2 better.
But either way you will be good.

Tman Cam 662-1 spec


23/45 248 660 101 215 102.5 44 overlap
49/21 250 660 104 198

 

the tw8 cam is staying in the 107" hillside build that is going on a dyna. As far as clutch, I am using a Barnett Scorpion clutch.

Frank, why do you thing the 662-2 would make me happier that the 662-1? It looks like the torque would come in a little later with the 662-2..no?

Do you feel that the compression bump is necessary. After talking to Dave at JD's cycle (my tuner), he suggests leaving the compression where it is and run the 662-1 with a set of roller rockers and call it a day.

TR at tman, does say the 662-1 likes to run at a little higher compression, but suggests going with Dave's advice. I just want to put this thing together ONCE for this season, and not make a mistake in the design of the build and have to do it again. If the consesus is to bump the compresion up 2-3 points, that is what i will do. How would you guys go about bumping it? head gasket or decking the heads?

 

TR said the same thing about my 103" build, run the 662-1s at 11.1:1 comp. Said that if i wanted the bike to run a little cooler i could bring the comp down to like 10.8 but he said it really shines at 11+. Im plannin on runnin a cooler anyway so as long as im not pegged at 90-95mph all day runnin through the back roads of texas in august it should be ok.
Also, for the ride i want the 662-1 was suggested because the Tq does come on a bit earlier and TR said its a fun cam to ride if ya like that punch down low.

 

PM sent.

And the 662-1 cam is just a higher lift version of a 590 TR will tell you that. I sell these cams also I think there great.
I have been talking with him about the 662-3 I am waiting on building a DBW blower motor with Pro Charger so I can use a set of these... Cant wait!!!!!!!!1

With 662-1 at lower rpm I would say from 1000/2500 it will make 3/5 tq more than a 662-2. from there on out it the 662-2 will make over all 8/12tq across the board and 10/12 more HP from 2500 and up!!!!
And at 10.8.1 or 11.1 those cams love comp....

Either way you will be happy.
Enjoy ride.

 

Yeah thats exactly what TR told me when i called him, the 662-1 is the "hot rod" version of the .590.

 

I don't see why the 662-1 would need higher compression to be right at home. Obviously, most cams/motors would shine alittle more as you raise compression, but is it necessary. I know Dave @ JD's, your tuner, has used the 662-1 at around 10.5-10.6:1 compression with success.

I'm no expert but... The 662-1 with its timing events set at 10.5-10.6:1 static compression will put the corrected compression numbers very close to other camshafts that have a 50-52* intake closing event, set at 11.0:1 static compression. Isn't that what matters?? Isn't that corrected compression value important to what allows you to control detonation and work the timing/fueling of the tune??


K.