Disappointed in my stage IV build - Road Glide Forums
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post #1 of 46 (permalink) Old 02-06-2013, 12:51 PM Thread Starter
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Disappointed in my stage IV build

HD stage IV build, the bike dynoed at max HP 78.31 and max torque 82.63 had a comp and leak down test done and front and back cylinders had 130psi comp and 8% leak down.

All SE parts put in the bike and this is the parts list

1- 22143-08 high comp piston 3 7/8 bore + .10 over
2- 17165-08A ACR performance cylinder heads which were polished
3- 17997-99A adjustable pushrods
4- SE 259E cam kit
5- 27713-08 SE 58mm throttle body
6- 27796-08 SE 5.3 gram per second fuel injectors

The only problem I can see is the builder used high comp pistons for stock heads when he should have used high comp pistons for the ACR performance heads which would have been HD part #22141-08B. I am disappointed in the results and am looking for suggestions on the fix would the wrong pistons give me that much performance drop or is there another problem?


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post #2 of 46 (permalink) Old 02-06-2013, 01:08 PM
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130psi , I'm surprised it even fires up.

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post #3 of 46 (permalink) Old 02-06-2013, 01:17 PM
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130psi , I'm surprised it even fires up.
Me too...... my stock 96 has 190 psi on both barrels.








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post #4 of 46 (permalink) Old 02-06-2013, 02:05 PM
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130psi could mean a couple things.

#1 The test was run with the throttle plate closed. If the engine can't pull in air it can't compress it either. The throttle plate MUST be wide open for a proper compression test.

#2 the cam is installed off a tooth or 2.

#3 pushrods are adjusted wrong holding the valves open.

Given the dyno test results I'd say the compression test was done right, and something else is wacked. Properly assembled you should have 180 to 200psi compression with any of the SE combos.

You just can't catch a break apparently..........sorry.

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post #5 of 46 (permalink) Old 02-06-2013, 02:11 PM
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Wow, stage IV and almost stock numbers....disappointed is an understatement, a simple cam would've done better. What does the builder have to say? I'm speechless, but it would have to be resolved.

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post #6 of 46 (permalink) Old 02-06-2013, 02:27 PM
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Even if the cylinder heads and pistons were mismatched AND were a complete mismatch to the cam you'd still be getting 175psi or more compression.
Those pistons make 10.5:1 with stock heads, if the heads have anywhere close to stock size chambers you should be at 190psi.

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post #7 of 46 (permalink) Old 02-06-2013, 02:28 PM Thread Starter
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The comp test was done with the throttle plate full open so it is done right. Leaning towards the wrong pistons put in by the builder, the builder used 10.5-1 pistons for stock heads but needed to use 10.5-1 pistons for the ACR performance heads. The ACR performance heads were for 99 to 06 models, HD discontinued the ACR heads and only have the MVA heads now but both heads have the same piston application. The builder ordered all the parts so I would think he is responsible but the only problem is that I don't want to take the bike back to him.


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post #8 of 46 (permalink) Old 02-06-2013, 02:36 PM
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I'm assuming the builder did not perform the dyno test - that would have been a shock to him as well I would think!

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post #9 of 46 (permalink) Old 02-06-2013, 02:40 PM
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Any idea what the chamber ccs are for those heads??
Using this compression calculator, http://bigboyzheadporting.com/TwinCamComp.htm

If I use 103", stock flat top pistons, the biggest cc SE heads I can find listed at 98cc's and a cam with a 47* intake close, the lowest compression I can come up with it 160psi.

Either way, the builder, if he's built more than 1 V-twin motor, should have known better, and should have been able to tell by ear it was gonna be a dog as soon as he started it.

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post #10 of 46 (permalink) Old 02-06-2013, 02:57 PM
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Originally Posted by ironmark View Post
The comp test was done with the throttle plate full open so it is done right. Leaning towards the wrong pistons put in by the builder, the builder used 10.5-1 pistons for stock heads but needed to use 10.5-1 pistons for the ACR performance heads. The ACR performance heads were for 99 to 06 models, HD discontinued the ACR heads and only have the MVA heads now but both heads have the same piston application. The builder ordered all the parts so I would think he is responsible but the only problem is that I don't want to take the bike back to him.
I understand you don't want to take the bike back to that builder, but if the builder is any good at all, they should feel obligated to get it right at there cost. If not, then yes you should go somewhere else, but first ask the builder. And if the builder is who dynoed the bike..... well he should know better.

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