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 Delta Level 2 Compresssion and Perfprmance 
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Joined: Thu Nov 19, 2009 1:46 pm
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Post Delta Level 2 Compresssion and Perfprmance
I had my engine rebuilt with Delta's Level 2 mods. I was running a 220 compression with shaved heads and shaved pistons, before the mods and I wanted to bring the compression down for longevity and I went with Delta's level 2 set up. I have an older PD 36 with a gen 2 lower. I have a mikuni and BPS rockers and push rods still installed.

I will say I was underwhelmed on the first run. I checked the plugs after the run and they were perfect, if not maybe a little lean. I then checked teh compression and bithe heads were at 120 each- which is a stock number? I did have a large load, three guys, 240, 220 and 185, two dogs a full tank of gas and two batteries. I was running 23-25. I bumped 26 at 4550 RPM's but it is still breaking in and I was mostly running at 4350. If I was going to run at 3800 i would have been plowing. I am assuming it will loosen up a little, but I was surprised to see the compression so low. I run a 1752 Cajun Performance (custom) center console.

Thoughts? Are these numbers about right or is something off? Just curious, because I'm going form a fairly hopped up motor.


Sat Nov 10, 2018 5:13 pm
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Joined: Fri Jan 10, 2014 1:16 pm
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Location: Gladewater TX
Post Re: Delta Level 2 Compresssion and Perfprmance
120 is lower compression than stock. As long as the compression test is accurate, throttle Is open, valves not to tight, gauge works etc... I would say your cam is installed with timing retarded a lot and closing the intake valve too late. Just to verify, your running a stock shortblock, stock cam, .045 delta heads? By your numbers the power doesn't seem to bad for that size load on a pd


Sun Nov 11, 2018 3:25 am
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Post Re: Delta Level 2 Compresssion and Perfprmance
Well shit- I did the compression test after several beers running the lake, and I don’t think I opened the throttle for the compression check. :lol: I’ll recheck compression later today.

Deltas level 2 comes with a cam, heads decked at .045 ( I believe) and a mikuni. I already had the mikuni, so I just swapped the BPS cam and IM heads for Delta’s and removed the shaved pistons and cusustom rods and changed them to stock. I still have BPS rockers, push rods and Q muffler.


Sun Nov 11, 2018 8:48 am
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Post Re: Delta Level 2 Compresssion and Perfprmance
I would think you would run faster than that bro. We ran 31 this morning with 3 big men over 200 lbs, a lab over 100 lbs, and a full hunt load. My 40 is stock with exhaust, air filter, cut skeg, and baggy prop. Would think with a stage 2 you would be faster. I guess it all has to do with the hull


Sun Nov 11, 2018 4:38 pm
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Post Re: Delta Level 2 Compresssion and Perfprmance
With that load I would have jumped up on plane no issue and run about 29-30 before the swap. The hull may not be the fastest, but my setup has never been left behind before with a load. This current set up feels like I went back to a stock motor- slow to get on plane, no balls, and slow to build speed. I didn't get a chance to check the compression again, but I will try to do that tomorrow.


Sun Nov 11, 2018 8:18 pm
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Post Re: Delta Level 2 Compresssion and Perfprmance
Recheck that compression while your are rechecking valve adjustments. I believe you now have a delta level 3, commonly referred to as a stage 2. 175-185 compression I think.


Sun Nov 11, 2018 9:38 pm
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Post Re: Delta Level 2 Compresssion and Perfrmance
I spoke to Jamie over at Delta, and it sounds like the Cam was not timed correctly on install. I am going to take it in and see if this fixes the problem- and you are right- I am running their level 3 set up. It is definitively not pushing 50 plus Hp. I finally had some time to pull the plugs and gap them. But, when I went to run the compression check my battery was dead... :twisted: :lol: It's charging, but I'll figure it out tomorrow.


Wed Nov 14, 2018 5:27 pm
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Post Re: Delta Level 2 Compresssion and Perfprmance
Update- Battery charged..wife went out... compression is dead on 180 in both heads.


Wed Nov 14, 2018 6:28 pm
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Location: Gladewater TX
Post Re: Delta Level 2 Compresssion and Perfprmance
The compression is good. If someone in your area knows how to use a degree wheel you could have cam checked without pulling it down. Other possibilities,, valves too tight, carb way out of tune, ign timing off, key moved, coils flipped, non cdi/cdi mixup etc, exhaust not flowing, weird batch of fuel, weird prop, new hook in boat,, I'm tying to thing of all longshot possibilities here, lol


Thu Nov 15, 2018 10:06 am
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Post Re: Delta Level 2 Compresssion and Perfprmance
The problem is fixed. I think I was essentially running on one head. When they did they did the head install one of spark plugs got damaged and had a 0 gap- yes.000. After I gapped my spark plugs to .030, the motor ran awesome all weekend for opener. I was carrying my "puddler rack", puddller, full hunting set etc on deep water and it was running 30-31.6 and then I backed off a little because the RPM's were close to 4700 and it's a new build. It was like whole different motor- probably the best it has ever run. I am glad it was an easy fix! Thank yof or the input Will C.


Sat Nov 17, 2018 5:01 pm
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Joined: Fri Jan 10, 2014 1:16 pm
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Post Re: Delta Level 2 Compresssion and Perfprmance
Dam I way over thought an easy fix, lol. Glad you get it lined out, badass man


Sun Nov 18, 2018 12:51 am
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