Topic: DP295 from Dynoman vs RC295 and a few other thoughts. (longish)

[PeWe]

The cam I found look hotter!
Wider lobes that reminds me about my Megacycle 125-20 with numbers close to Kenny Harmon F.  Unknown cam is like a blind date with something very curvy
K134 is stamped on many aftermarket cams it is just the billet stamp when molded. Grinders use billet blank cams to be grinded and shaped to chosen profile.
Except Megacycle that use old cams, stock cams they adding material on by welding and grind. Honda stock cams have a smoother surface between lobes not toad skin pattern after the mold This is hard welded that also web cam offer. More durable. Hard welded rocker arms also available from web cam and Megacycle.

Those pistons look nice!
You'll fix the head completely, right?
Cheapin out not doing everything when apart will cost more in the end. Take it apart again cost gaskets. I have tried
If surfaces are good, use MLS head gasket that can be reused several times. When viton rubber is worn, scrub loose particles off, spray it with Loctite 3020. I have not done that yet, got the tips from a guy that usually do that in his shop.
But I lifted head 1 or 2 times and tightened again with MLS for my 836. Not that much used between.

[livefast_dieold]

Ric, you'll notice a big improvement on the shorter twisty circuits with the DP295 cam.

what can I expect as a usable power band? more or less obviously :-)

[Sam Green Racing]

Ric, there isn't really one noticeable, just smooth power from the get go.
My bike was a CB750 2 speed automatic but when I had the Megacycle 125 75 cam in it, you really could feel the kick in at 7,000 up to 10,000.
The DP295 was half a second quicker over the quarter mile than it was with the 125 75 cam and that's a big jump.
Are you by any chance on Facebook. I have video of the bike running over the quarter mile but Facebook videos don't play on here unless you are a member, here's the link anyway.

https://www.facebook.com/579151338763550/videos/695993873745962/UzpfSTIwNTY2OTM4NjI2NjA0Nzo4NDMxNjQ0NTU4NDk4Njc/

Sam.

[livefast_dieold]

Ric, there isn't really one noticeable, just smooth power from the get go.
My bike was a CB750 2 speed automatic but when I had the Megacycle 125 75 cam in it, you really could feel the kick in at 7,000 up to 10,000.
The DP295 was half a second quicker over the quarter mile than it was with the 125 75 cam and that's a big jump.
Are you by any chance on Facebook. I have video of the bike running over the quarter mile but Facebook videos don't play on here unless you are a member, here's the link anyway.

https://www.facebook.com/579151338763550/videos/695993873745962/UzpfSTIwNTY2OTM4NjI2NjA0Nzo4NDMxNjQ0NTU4NDk4Njc/

half a second on the quarter mile it's A LOT! Now I really look forward to test my new cam!!!
Just watched the video, for a second I forgot that your bike is auto and I thought wow that's some serious LONG gearing right there
Sam.

[bear]

I maybe getting the wrong end of the stick here but it seems a lot of people (PeeWee aside) are fixated with where these cams start working in the rev range.
I was always more interested in HP/torque curves and their relationship to each other.
As we know single overhead cams cannot have their curves tuned( for want of a better word), but their position as a unit within a rev range most certainly can be.

Taking Mike's preferred cam as an example.
The Megacycle 125/75. This cam will start entering it's "sweet spot" around 7K rpm, but I moved the curves down the rev range approximately 2K rpm by advancing the timing 5 degrees over it's card for my application.
The result can be seen on the sheet I uploaded to the dyno  thread elsewhere on this forum many year's ago.

I'm not suggesting that this something "Joe Blogs" up the road should be trying on his street bike but for my application at the time it worked well.

Cheers,
Brian

[PeWe]

This dyno?
http://forums.sohc4.net/index.php/topic,83748.msg944214.html#msg944214

Lots of cc too!

Edit:
More cam talk in another thread. I guess theoretical numbers of same setup. Interesting details
http://forums.sohc4.net/index.php/topic,107714.msg1235933.html#msg1235933

I found more good information:
 If cam is advanced or retarded regardless of what cam card say.
Maybe no cam card or the card is not matching the timed result. LC is not always equal.

"Compare IN open and EX close at .050 lift.

Subtract one from the other and divide by 2 gives you how many degrees the cam is advanced or retarded.     
If inlet no is highest then it will be advanced, if exh was highest then it is retarded."

Very simple and most likely known by many well worth to be repeated.

http://forums.sohc4.net/index.php?topic=125524.msg1440381.msg#1440381

[Sam Green Racing]

Ric, there isn't really one noticeable, just smooth power from the get go.
My bike was a CB750 2 speed automatic but when I had the Megacycle 125 75 cam in it, you really could feel the kick in at 7,000 up to 10,000.
The DP295 was half a second quicker over the quarter mile than it was with the 125 75 cam and that's a big jump.
Are you by any chance on Facebook. I have video of the bike running over the quarter mile but Facebook videos don't play on here unless you are a member, here's the link anyway.

https://www.facebook.com/579151338763550/videos/695993873745962/UzpfSTIwNTY2OTM4NjI2NjA0Nzo4NDMxNjQ0NTU4NDk4Njc/

half a second on the quarter mile it's A LOT! Now I really look forward to test my new cam!!!
Just watched the video, for a second I forgot that your bike is auto and I thought wow that's some serious LONG gearing right there
Sam.

Long gearing Ric, haha it couldn't have been geared much lower. It was geared to pull peak power revs as I crossed the finish line, 116 mph @ 10,000 rpm.
As you know, most bikes on standard gearing will rev their nuts off in the lower gears but as soon as they reach maximum power revs in top gear, the bike stops pulling.
On one occasion, my throttle stuck wide open as I crossed the finish line and I saw around 13,500 to 14,000 on the tach before hitting the kill switch. Thank God for Carrillo rods. haha.
It was on my bucket list to eventually take the bike to Maxton in Carolina and put it over the Standing Mile, sadly this never happened but I'm sure 150 to 160 mph would have been on the cards
had the bike still had the Megacycle 125 75 cam in it, but the Maxton Mile is not drag racing.

Brian (Bear) if you read this, as well as for street and drag racing, the DP295 cam is also recommended for sidecar use.

Sam.

[bear]

Brian (Bear) if you read this, as well as for street and drag racing, the DP295 cam is also recommended for sidecar use.

Sam.
[/quote]


Thanks for pointing that out Uncle Sammy but I need another cam like I need a hole in the head, like you my racing day's are long gone.
As a matter of fact in amongst the mountain of stuff the lovely Evelyn keeps pushing me to get rid of is a box of cams that I must sort through one day.

Cheers,
Brian

[bear]

This dyno?
http://forums.sohc4.net/index.php/topic,83748.msg944214.html#msg944214

Lots of cc too!

That was our baby, one of our other units came in at just under 1'300cc's 

[PeWe]

....... pushing me to get rid of is a box of cams that I must sort through one day.

Is that really possible?
Cams are fun and I'm sure that each of your cams brings up memories from the past when you look at it

With that amount of cc, plenty of torque will always come early independent of cam, right?

[bear]

....... pushing me to get rid of is a box of cams that I must sort through one day.

Is that really possible?
Cams are fun and I'm sure that each of your cams brings up memories from the past when you look at it  

Not really Per it was about the racing. I've always been fairly pragmatic about the engineering.

With that amount of cc, plenty of torque will always come early independent of cam, right?

The potential is certainly there but believe me, a bad cam can stuff up any motor I've done it on more than one occasion over the years.   

[MRieck]

This dyno?
http://forums.sohc4.net/index.php/topic,83748.msg944214.html#msg944214

Lots of cc too!

That was our baby, one of our other units came in at just under 1'300cc's 

Looks like peak torque occurred around 5,800 RPM. Nothing wrong with that.

[PeWe]

This dyno?
http://forums.sohc4.net/index.php/topic,83748.msg944214.html#msg944214

Lots of cc too!

That was our baby, one of our other units came in at just under 1'300cc's 

Looks like peak torque occurred around 5,800 RPM. Nothing wrong with that.

No need to rev it until a stockers red line!
No risk for valve float here, right?
Really useful power curve for a street bike!

[bear]

This dyno?
http://forums.sohc4.net/index.php/topic,83748.msg944214.html#msg944214

Lots of cc too!

That was our baby, one of our other units came in at just under 1'300cc's 

Looks like peak torque occurred around 5,800 RPM. Nothing wrong with that.

Absolutely, that's right on the button for us with that motor. A nice curve nothing twitchy about it's power delivery at all.