Which cam?

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Jul 26, 2023 | 05:25 PM

#11

user 7209823083

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Quote:

Originally Posted by topcat1st

Im the OP. the cam is a 570cycle rama and not the 570-2. I had a T man 555 in the bike and decided to try the 570 It does come on quick with a lot of torque on botttom end but it ran out faster than the 555. The reason Im pulling the 570 is because of cam noise from the quick ramps and short duration. another guy had the same problem with his 570. I have but have never run a 54h cam so Im thinking about trying it. Andrews cam recommended it for my engine , tell me what you think.

I really don't know which cam would work best in your bike, the only thing that comes to mind is the "camshaft shootout" that fuel moto have on their website, with Dyno charts for a number of cams using a 103 TC as test engine. Even if your bike has a bit different setup with higher compression and ported heads there might be some useful information.

My point here was that in these discussions people tend to think that torque and power are somehow independent properties, like "I prefer torque over power..", which is a misunderstanding of the physics involved.

There is really no point in having curves for both power and torque in a Dyno chart, they carry exactly the same information and each one of them can be constructed from the other one.

But his is off topic, I apologize for sabotaging your thread.

Jul 26, 2023 | 05:46 PM

#12

shineola

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Joined: Oct 2005

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Do yourself a favor and wander over to HTT website, click on Dino runs try page 5 from December third 2017 started by Ancient. This just happens to be one of my favorite 103 Dyno builds that I have seen and I am also a big fan of the exhaust pipe which not a lot of people are. I think the components you’re speaking of may help you with some of your answers to which Cam to go with. I like the T-man

Jul 26, 2023 | 06:23 PM

#13

60Gunner

Grand HDF Member

Joined: Sep 2017

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From: Dubuque, IA

Quote:

Originally Posted by shineola

Looks just like my torque curve. The same guy set up my heads. He will tell you the Tman 580 in this case. I'd put money on jt.

Jul 26, 2023 | 10:17 PM

#14

PureHybrid

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Joined: Mar 2013

Posts: 817

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From: Central Ohio

Who's street port? 82cc should get you over 10:1 even with the pistons -.008". What are the specs of this CR570? I wouldn't be afraid to run that Tman 555 either, the heads should make it still pull decent on top

Jul 27, 2023 | 09:24 AM

#15

harpwrench

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Joined: Oct 2010

Posts: 405

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From: NW MO

The first CR570 was 14/32 intake and 49/3 exhaust

I would try the 54 first, then try it 4 degrees advanced for fun. You’ll probably know immediately if you like it better or not. I would want a full sized crossover tube if it doesn’t have one, and working with the disc count is worth the effort. I would get some longer screws and extra discs, and have always had better response with closed end caps. Not enough discs kills mid-upper power a lot. I would guess around 20-25 discs per side and I like a couple more on the left on both my bikes.

Aug 5, 2023 | 09:03 AM

#16

topcat1st

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Joined: Apr 2014

Posts: 156

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From: nc

I’ve installed the Tman 555 torqster, I am using Smith brother easy install pushrods and I am waiting on a set of there pushrod tubes for there pushrods. I installed a set of Vulcan rocker arm supports with shaft locks and new S&S precision lifters. I checked my piñion runout and have .0025 total, pleased with that.

Aug 5, 2023 | 07:31 PM

#17

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 21,025

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From: Poolville

....

Aug 12, 2023 | 01:59 PM

#18

topcat1st

Thread Starter

Club Member