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Author Topic: 124" big bore CVO from Rev Performance  (Read 5776 times)

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Zinister

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124" big bore CVO from Rev Performance
« on: September 14, 2011, 12:37:21 AM »
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hogasm

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Re: 124" big bore CVO from Rev Performance
« Reply #1 on: September 14, 2011, 06:39:00 AM »
3
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Heatwave

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Re: 124" big bore CVO from Rev Performance
« Reply #2 on: September 14, 2011, 06:57:24 AM »
Quote from: Zinister on September 14, 2011, 12:37:21 AM
Has anyone built one yet?

http://www.revperf.com/TwinCam/twinCamPerformKits.html


Very interesting! Since I've already had the headwork, roller rockers, adj pushrods, larger injectors (5.3gm/sec), 58mm TB, Woods 408-6 cams and Power Vsion Tuner installed, the 124" jugs and pistons might be a nice fit for an upgrade.
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Zinister

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Re: 124" big bore CVO from Rev Performance
« Reply #3 on: September 14, 2011, 09:53:49 AM »
Hogasm,

You have built 3?


Any thoughts on them they look impressive from the dynos on the same site.

Comparisons to the S&S 126 G2 motor?
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SBB

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Re: 124" big bore CVO from Rev Performance
« Reply #4 on: September 14, 2011, 10:56:44 AM »
Quote from: Zinister on September 14, 2011, 09:53:49 AM
Hogasm,

You have built 3?


Any thoughts on them they look impressive from the dynos on the same site.

Comparisons to the S&S 126 G2 motor?


 ::)     ::)      ::)


 :vrolijk_11:

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Dr.D

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Re: 124" big bore CVO from Rev Performance
« Reply #5 on: September 14, 2011, 11:01:56 AM »
Yes Hogasm waiting to hear all about them. What about longevity? Please include the ups and downs.
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erniezap

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Re: 124" big bore CVO from Rev Performance
« Reply #6 on: September 14, 2011, 11:15:31 AM »
I had a RevPerf 124 as well.  Built it for 2 up cruising and mid-range torque.

The good:
The engine was everything that I wanted it to be.  Fast, could pull down a house, and was a lot of fun to ride!

The bad:
It would go through head gaskets about every 5K miles

I know that RevPerf and Cometics have been working together on a new head gasket and I believe that they have tested and are shipping the new design, so hopefully the head gasket issues are behind them.
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hd-dude

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Re: 124" big bore CVO from Rev Performance
« Reply #7 on: September 14, 2011, 12:52:55 PM »
I have done 3 of them, all three have had multiple head gasket failures. I just redid one of them with a new style head gasket from Cometic. Time will tell......

As far as power goes the best was 148.6HP, 144.8TQ This was with Revperf stage III heads and a TW9FG cam.
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FAST380

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Re: 124" big bore CVO from Rev Performance
« Reply #8 on: September 14, 2011, 03:24:24 PM »
Quote
148.6HP, 144.8TQ

There is no doubt I would hurt myself.....  :nixweiss:
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SBB

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Re: 124" big bore CVO from Rev Performance
« Reply #9 on: September 14, 2011, 03:26:00 PM »
Quote from: FAST380 on September 14, 2011, 03:24:24 PM
There is no doubt I would hurt myself.....  :nixweiss:

Wouldn't take no where near that much for me to hurt myself.

 :(

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Heatwave

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Re: 124" big bore CVO from Rev Performance
« Reply #10 on: September 14, 2011, 03:37:14 PM »
Quote from: FAST380 on September 14, 2011, 03:24:24 PM
There is no doubt I would hurt myself.....  :nixweiss:

Nahhhhhh, but it sure would result in an expensive rear tire replacement bill!!!
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hogasm

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Re: 124" big bore CVO from Rev Performance
« Reply #11 on: September 14, 2011, 05:56:57 PM »
1st motor had 35k on it with a Screamin Eagle crank that was only ballanced. CP pistons, fueling oil pump and plate, T-Man 650g cams. No oil leaks

2nd motor has 15k on it with a Screamin eagle crank, balanced welded and Ultima rods. weisco pistons, fueling oil pump and plate, T-Man 625g cams, cylinders are from 1st motor and were re-Nickacelled and honed for Weisco pistons. No oil leaks

3rd motor has 17k on it with a stock 4" crank with custom rods, ceramic bearings, balanced and welded. Weisco pistons in 4.25" cylinders....same as 124" but smaller crank. HD oil pump and plate, T-Man 625chain drives custom ground down to new profile. No oil leaks

When I did the last 2 motors we assembled the bottom end and then honed down the surface to make sure the base gaskets layed on a smooth surface. Cometic has a special torque sequence that was done, and they were installed dry, but the motor was heated up to 145 degrees before torqueing  . This was something we did on the race car motors.

Zinster I can not comment on the S&S motor. Have never ridden one so I can not compare

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hogasm

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Re: 124" big bore CVO from Rev Performance
« Reply #12 on: September 14, 2011, 06:02:59 PM »
Quote from: Heatwave on September 14, 2011, 06:57:24 AM
Very interesting! Since I've already had the headwork, roller rockers, adj pushrods, larger injectors (5.3gm/sec), 58mm TB, Woods 408-6 cams and Power Vsion Tuner installed, the 124" jugs and pistons might be a nice fit for an upgrade.

Just remember that once you go to the 4.25" cylinders your cases can not go any larger. With the 4.25" cylinders you don't leave much room for a base gasket to seal properly. It will seal properly if you take your time and get everything right. Do not just throw it together and hope for the best.

If I were to do it again, I would only go with 4.125" cylinders making a 117" with the 4.385" crank. At least with this combo you can go bigger later if you must.

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HD Street Performance

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Re: 124" big bore CVO from Rev Performance
« Reply #13 on: September 14, 2011, 09:08:07 PM »
I would use the RP cylinders in a heartbeat and the latest ones I have had experience with have worked well. I would not go 4.250 bore on stock cases.
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hd-dude

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Re: 124" big bore CVO from Rev Performance
« Reply #14 on: September 14, 2011, 09:12:01 PM »
Quote from: Deweysheads on September 14, 2011, 09:08:07 PM
I would use the RP cylinders in a heartbeat and the latest ones I have had experience with have worked well. I would not go 4.250 bore on stock cases.

I agree and continue to use thier products, just not the 4.25" bore stuff
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