Degree'd my S2 Pro 1's
Hope to get some input about how my numbers look before I move on and find valve clearance. Dialing in as much as I can while the engine is on the engine stand. Maybe get a couple answers from those who've been here.
Short block is all new internals. Head and cams have been run before by the previous owner, head has been resurfaced since then. GSR build, block and head Supertech, 81.5, 11:1 pistons Eagle rods Supertech flat faced valves Supertech valve springs and retainers S2 cam gears Skunk 2 Pro 1 cams Installed the Skunk2 Pro 1 cams and degree'd using the lift method @ 0.040, disregarding centerline all together. Skunk2 cam card specs Intake: Open 30° BTDC Close 48° ABDC 258° duration Lift .498" Exhaust: Open 55° BBDC Close 25° ATDC 260° duration Lift .470" My final measurements Intake +2.5 Open 33.5° BTDC Close 51° ABDC 264.5° duration Lift .493 Exhaust -1.5 Open 56.5° BBDC Close 26° ATDC 262.5° duration lift .462 After running the centerline and lobe separation angle algorithm Skunk 2 Cam Card Intake centerline: 98° Exhaust centerline 105° LSA: 101.5° My measurements Intake CL 98.75° Exhaust CL 105.25° LSA 102° Just checking if there's anything I should be looking for/at. Block has been decked, maybe a couple times. The head has had a good amount taken off as well. |
Re: Degree'd my S2 Pro 1's
looks good to me. thats actually much closer than I was expecting. almost all aftermarket cams will have a +/-5* or so variance. proper measurement of actual valve lift can add some variance too. even a 0.001" difference could mean 1-4 degrees difference.
what did you get for peak lift compared to card spec? |
Re: Degree'd my S2 Pro 1's
I made sure I had repeatable measurements before moving anything. I had the dial gauge stick a couple times, had to adjust the angle a little and it was good.
Added peak lift to the first post. |
Re: Degree'd my S2 Pro 1's
yup, all seems normal.
I'm assuming you set lash to less than 0.001" for the measurements? |
Re: Degree'd my S2 Pro 1's
Yes sir. Thanks for your input. Hope I can check valve clearance later today.
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Re: Degree'd my S2 Pro 1's
Measured p-v clearance and it looks good to me. Any input is always appreciated.
https://cimg6.ibsrv.net/gimg/honda-t...4ff5f06bbf.jpg |
Re: Degree'd my S2 Pro 1's
Please excuse my ignorance....
If I may ask, to measure P2V clearance at each of the degrees you have, are you having to remove the head and reinstall each and every degree with fresh clay each time? |
Re: Degree'd my S2 Pro 1's
Hell no. lol I have a dial indicator riding on the valve spring retainer. That valve spring is also replaced with a 1 lb spring I can compress by hand.
https://cimg3.ibsrv.net/gimg/honda-t...0e461d9e12.jpg The piston goes down, and the piston goes up. The intake cam opens 33.5° before top dead center (TDC), and closes 51° after bottom dead center (BDC). The exhaust opens 56.5° before BDC (BBDC), and closes 26° after TDC (ATDC) The valves will be closest to the piston when the piston is near TDC. So we measure for intake valve clearance when it opens, and exhaust valve clearance when it closes. I rotate the crank and the cam opens the valves. Starting at 15° before top dead center I zero the dial gauge (the cam has the valve open) and press the spring down to check when the valve hits the piston. I don't care how much the cam is opening the valve, I only care about how much free space there is between the valve and the piston at that degree of crankshaft rotation. I then checked every 5° through to 20° ATDC, zeroing the gauge every time. This gives an idea about where the P-V clearance is most narrow. I then checked again in 1 degree increments where the P-V clearance was narrow. You see the final measurements through that range in the above picture. I will probably run clay once to see the clearance between the valve and side of the valve relieves on the piston. |
Re: Degree'd my S2 Pro 1's
I never thought to do it like that. I like it, good idea :)
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Re: Degree'd my S2 Pro 1's
Got it from Jafromobile on YouTube. Tons of great info there.
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Re: Degree'd my S2 Pro 1's
That's a pretty cool way of doing it that most never think about!
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Re: Degree'd my S2 Pro 1's
I didn't see it mentioned, but how did you lock the rockers?
What type of spring are you using? Nice to see some tech in here :) |
Re: Degree'd my S2 Pro 1's
I locked VTEC by swapping the long and short VTEC pins. This only locks in one valve, but that's all I needed to measure p-v clearance.
They sell special lightweight springs for checking valvetrain at Summit and other places. The springs I bought, I found at True Value Hardware, its just a spring to hold the valve up. The springs I used are pictured below. They're about 5" long, and they bind when compressed to about 1", plenty of range to check p-v. https://cimg2.ibsrv.net/gimg/honda-t...a25ef068cb.jpg |
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