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 Post subject: New DCP top end
PostPosted: Tue Apr 14, 2015 9:42 pm 
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Joined: Fri Jan 12, 2007 2:17 pm
Posts: 2858
Location: Wichita ks
Well it look like time for a top end on DCP Engine. The current top end has right at 37 hours on it. I did munch a reed a while back and had notice some performance issues nothing major though. I'm starting to feel better to where I can get back to the garage and play. As most know I had taken back four piston that for one reason or anther had some issues. So I thought to my self why not play with them. So I built a new top end using one of the pistons. I opped to run it a .0035 clearance, Yes I know that's to dam tight and I do not recommend it to anyone to do so. DO NOT try that at home please.

As always I air test the Engine before disassembly and found a air leak at the main seal clutch side. Easy fix just pull it, polish and reinstall. Then precede to remove the top end and put back together. I will not bore you with a bunch of details other then this is an experiment with a high CR and a tight bore, after all I have three more pistons to play with. I did leave the static timing alone since the DCP already has it altered. I felt this would be a good base line for the octane involved or change in octane that is. I want to study the LPP effects with the altered timing according to octane. Sorry BLA BLA BLA. I thought to my self why not so I went for it. I will need to get an EGT to help me in re-quards to the octane since I can use it to gauge the effects on higher octane and detonation. Since the high CR will lower the EGT reading from a lower CR Engine using the same fuel I thought it might just come in handy for that reason. This of course if the thing to seizure up on me. You may ask why so tight. I want to see what the effect on the rings and it's pressure will have based on the end gap and a few other things.

A few note to start with the base line static pressure level is 172 before the Engine had ran and after it warmed up (first heat cycle) it went up to 181. Again an experiment on assembly to get the rings to seat quicker. The heat cycle water temp was 105 degrees when the test was done. With the high CR and octane in the machine the Engine temp came up quick. This could be for a few other reasons as well so it will be something I will keep my eye on as I go. I have been working on heat transfer from the piston crown and have seen some success so far. I have a piston pic where the under side of the crown is pretty dam good for a piston ran for 37 hours at high rpm. I will compare this to the now higher CR piston and evaluate.

Any way thought I would share some playing around pics of the build, nothing great just normal stuff.


Attachments:
File comment: pic of the head after I removed it
Head removed.JPG
Head removed.JPG [ 318.08 KiB | Viewed 442 times ]
File comment: piston crown of 37 hr Engine
Piston crown color.JPG
Piston crown color.JPG [ 262.71 KiB | Viewed 442 times ]
File comment: darn main seal any who
Main seal leak.JPG
Main seal leak.JPG [ 29.45 KiB | Viewed 442 times ]
File comment: cleaned up the crank and yes I removed the old rubber stuff from the case
cleaned up crank face for new seal.JPG
cleaned up crank face for new seal.JPG [ 38.7 KiB | Viewed 442 times ]
File comment: Bottom side of the 37 hr piston
Bottom side of piston.JPG
Bottom side of piston.JPG [ 266.67 KiB | Viewed 442 times ]
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 Post subject: Re: New DCP top end
PostPosted: Tue Apr 14, 2015 9:47 pm 
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Joined: Fri Jan 12, 2007 2:17 pm
Posts: 2858
Location: Wichita ks
more pics


Attachments:
Note on new piston.JPG
Note on new piston.JPG [ 348.61 KiB | Viewed 438 times ]
New piston in.JPG
New piston in.JPG [ 37.62 KiB | Viewed 438 times ]
Studs in and new gasket.JPG
Studs in and new gasket.JPG [ 36.57 KiB | Viewed 438 times ]
New piston.JPG
New piston.JPG [ 30.84 KiB | Viewed 438 times ]
Head on.JPG
Head on.JPG [ 48.03 KiB | Viewed 438 times ]
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 Post subject: Re: New DCP top end
PostPosted: Tue Apr 14, 2015 9:48 pm 
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Joined: Fri Jan 12, 2007 2:17 pm
Posts: 2858
Location: Wichita ks
more pics


Attachments:
air test pressure 1.JPG
air test pressure 1.JPG [ 282.96 KiB | Viewed 438 times ]
Air test pressure 2.JPG
Air test pressure 2.JPG [ 277.69 KiB | Viewed 438 times ]
Air test Vacume 1.JPG
Air test Vacume 1.JPG [ 301.47 KiB | Viewed 438 times ]
Air test Vacume 2.JPG
Air test Vacume 2.JPG [ 284.68 KiB | Viewed 438 times ]
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 Post subject: Re: New DCP top end
PostPosted: Tue Apr 14, 2015 9:52 pm 
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Joined: Fri Jan 12, 2007 2:17 pm
Posts: 2858
Location: Wichita ks
last one until it seizes


Attachments:
New top ens cold.JPG
New top ens cold.JPG [ 262.03 KiB | Viewed 438 times ]
New top end Warm.JPG
New top end Warm.JPG [ 311.74 KiB | Viewed 438 times ]
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 Post subject: Re: New DCP top end
PostPosted: Tue Apr 14, 2015 10:12 pm 
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Joined: Sun Feb 23, 2014 10:01 pm
Posts: 379
Location: Monette Ar
sounds like an expensive test :-)


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 Post subject: Re: New DCP top end
PostPosted: Tue Apr 14, 2015 11:07 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22133
Location: Chicago
If you get time can you post some detailed pictures of the thrust sides of the 37 hr piston?

What oil ratio are you running?

Not unusual to see the clutch side seal fail at the end of my running the 400 Pilot Engine I just changed the clutch side crank seal every season while I had the clutch off for its annual inspection, I have a bunch of those seals, I ordered like 8 of them then about a year later must have forgot and ordered another 6 or so my parts box is over flowing lol

Keep us posted. Hopefully you will rack up at least 37 hrs this season.


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 Post subject: Re: New DCP top end
PostPosted: Fri Apr 24, 2015 1:22 pm 
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Joined: Fri Jan 12, 2007 2:17 pm
Posts: 2858
Location: Wichita ks
Got a phone call about my clearance number, my bad can't edit it. .0035, sorry.


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 Post subject: Re: New DCP top end
PostPosted: Fri Apr 24, 2015 3:02 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22133
Location: Chicago
adnoh wrote:
Got a phone call about my clearance number, my bad can't edit it. .0035, sorry.


Good catch by someone THANKS I read right over that, went back and made the edit for you...


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 Post subject: Re: New DCP top end
PostPosted: Sun Dec 27, 2015 3:51 pm 
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Joined: Tue Dec 23, 2003 10:31 pm
Posts: 5540
Location: New Jersey
Glad to see those pistons are being used!


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