Evo vs Twin Cam: Which is Better? : V-Twin Forum: Harley Davidson Forums
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View Poll Results: Which is better; the Evo or the Twin Cam (or both)
Evo 49 45.79%
Twin Cam 61 57.01%
Multiple Choice Poll. Voters: 107. You may not vote on this poll

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Old 01-05-2009, 10:44 PM   #1 (permalink)
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Evo vs Twin Cam: Which is Better?

Does the simplicity of the Evo motor make it more reliable and bullet proof or does the more refined Twin Cam hold that title.

I can think of two weaknesses of the Twin Cam; cam chains and oil blow-by out the breather.
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Old 01-05-2009, 11:41 PM   #2 (permalink)
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Quote:
Originally Posted by BoomerBob View Post
Does the simplicity of the Evo motor make it more reliable and bullet proof or does the more refined Twin Cam hold that title.

I can think of two weaknesses of the Twin Cam; cam chains and oil blow-by out the breather.
I know absolutly nothing about the Evo, but I can name several more weaknesses on the Twinkie.

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Old 01-06-2009, 12:05 AM   #3 (permalink)
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I know absolutly nothing about the Evo, but I can name several more weaknesses on the Twinkie.
Please name them. I'm on my third and still learning about them.
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Old 01-06-2009, 12:58 AM   #4 (permalink)
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TC88 heads flow 10% less than stock EVO 80"

Mainly due to small exhaust port & small exhaust valve (EVO Ex valve & port are bigger)

EVO runs much cooler

EVO is faster than TC88

EVO gets better gas mileage also..

On an EVO: You do NOT need to spend a lot of $$ to try to cool down the temperature like on the TC.

PS: EVO is the most 'cloned' motor IMO to date.. Why would that be ??

Guess, it may be obvious as to my preference..
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Old 01-06-2009, 07:47 AM   #5 (permalink)
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Quote:
TC88 heads flow 10% less than stock EVO 80"

Mainly due to small exhaust port & small exhaust valve (EVO Ex valve & port are bigger)

EVO runs much cooler
Isn't this more due to EPA?
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EVO is faster than TC88
Huh?
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EVO gets better gas mileage also..
Didn't know that. My stock TC96 got 46 mpg.
Quote:
On an EVO: You do NOT need to spend a lot of $$ to try to cool down the temperature like on the TC.
EPA again.
Quote:
PS: EVO is the most 'cloned' motor IMO to date.. Why would that be ??
Because it's been around longer? There was a company that was shut down by Harley for making TC cases. R&R is coming out with TC cases shortly.
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Old 01-06-2009, 08:09 AM   #6 (permalink)
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http://www.v-twinforum.com/forums/ev...aving-evo.html

Enjoy


Quote:
PS: EVO is the most 'cloned' motor IMO to date.. Why would that be ??
Because Harley will sue you for patent infringement for making Twin Cam engine cases.
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Old 01-06-2009, 08:43 AM   #7 (permalink)
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Quote:
Originally Posted by springer- View Post
http://www.v-twinforum.com/forums/ev...aving-evo.html

Because Harley will sue you for patent infringement for making Twin Cam engine cases.
Thanks for the link back to 05'. I'm having a great time reading it!

Also; why would HD sue for the TC but not the Evo? Aren't they both patented?
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Old 01-06-2009, 09:12 AM   #8 (permalink)
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Thanks for the link back to 05'. I'm having a great time reading it!

Also; why would HD sue for the TC but not the Evo? Aren't they both patented?

I am not positive but I think there is a time limitation and the cases for an EVO are basically the same for a Shovel that came out in 1970. There may have also been some sort of deal made with the aftermarket. The Twin Cam patented the engine to transmission mount as well as some other features. This is why the aftermarket can not make them. R&R had to change many of the Twin Cam designed so as to not infringe on the patents. They are only available in an EVO style mount. I believe JIMS or S&S made some Twin Cam cases for a short period of time before they were sued and forced to stop.
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Old 01-06-2009, 11:45 PM   #9 (permalink)
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My .02

Back in '79, AMF & Porsche started working on the Evo prototype & later developed it. Later yet, Willie G & crew bought back HD, now there were 2 new bikes ready to market, Evo & the Nova project.. Not having deep pockets after the buy-back, they could only afford to chose one to market: the Evo, (which IMO was a good choice) but couldn't afford to patent it as much as the TC is.

So after a while the (then) new fangled Evo seemed to be working out Ok. But was not protected from cloning of parts, & later whole motors..


I can remember stories of my Uncle telling me that when the Panhead first came out (1948) how much better his Knuck was.... & when I had my '63 FL, I thought Shovels were not as good..

The cycle continues..

PS: But I still ride my Flathead...
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Old 01-10-2009, 10:01 AM   #10 (permalink)
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Quote:
Originally Posted by springer- View Post
http://www.v-twinforum.com/forums/ev...aving-evo.html

Enjoy




Because Harley will sue you for patent infringement for making Twin Cam engine cases.

That thread made my head hurt.....lol
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Old 01-11-2009, 06:35 AM   #11 (permalink)
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patent is for the b motor. if you buy an s$s 124 twin cam a motor, it will be using s$s cases.
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Old 01-11-2009, 09:19 AM   #12 (permalink)
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EPA has a big role of engine development. Harley survived EPA regulations, by-product was heat due to a restricted engine, Caterpillar can't make truck line engines meet EPA and gave up on R&D, they are saying bye-bye to the truck market and focusing on the industial side.

Give HD engineers credit for meeting EPA and not having to scrap the V-twin as we know it, Twin Cams are on the market and plenty of parts to make them run and the future unless you dare to say "overhead cams"

I ride with Shovels, Evo's, Twin Cams and a fan of the Evo for simplicity reasons but each engine has it's strengths. Depends on how much money is in each engine to determine which is the fastest, never rode with a Harley that went down so it's all good!
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Old 01-11-2009, 09:39 AM   #13 (permalink)
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patent is for the b motor.
The Patent is for all Twin Cam engine to transmission mounts and the Twin Cam oil system. Yes S&S makes a 124" that will bolt in but you can be sure that HD gets a slice of that pie.
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Old 01-11-2009, 10:19 AM   #14 (permalink)
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The Patent is for all Twin Cam engine to transmission mounts and the Twin Cam oil system. Yes S&S makes a 124" that will bolt in but you can be sure that HD gets a slice of that pie.
R&R is coming out shortly with there billet aluminum twin cam case that will allow the later transmissions to mount.There will be some changes such as the stock camplate that will not interchange and probably a few more to avoid patent issues.
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Old 01-12-2009, 10:26 PM   #15 (permalink)
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