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  #31  
Old 02-10-2006, 03:35 PM
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Quote:
Originally Posted by NeedForSpeed
...
WC-505 [9MM/.352"]: 234*/230*/220*/200*/176*/134*/108*/ 76*
Nice find. I did some digging on that profile, and its for a '94-'97 Miata 1.8 motor. The stock cam for that motor has 0.339" lift, and 254 deg total duration. I called up Scott, and he said its got 204 deg duration at 0.050" lift. He's going to get duration at 0.006"/0.010"/0.020"/etc on Monday morning.
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  #32  
Old 02-10-2006, 03:52 PM
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As for factory cams, bmw, mercedes, porsche, nissan and saab have dohc hyd, and apparently some Mazda. Probably more.
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  #33  
Old 02-10-2006, 03:53 PM
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Please post. Also, please ask for [and post] the base circle diameter.

Quote:
Originally Posted by mbtoloczko
Nice find. I did some digging on that profile, and its for a '94-'97 Miata 1.8 motor. The stock cam for that motor has 0.339" lift, and 254 deg total duration. I called up Scott, and he said its got 204 deg duration at 0.050" lift. He's going to get duration at 0.006"/0.010"/0.020"/etc on Monday morning.
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  #34  
Old 02-11-2006, 08:49 AM
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Where are you getting 325cfm from I saw 239 messing around with clay at
.450 unless I typed it in wrong.
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  #35  
Old 02-11-2006, 02:23 PM
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My typo. I'll fix it above. Please amend if necessary. Did you happen to record the intake flow at .300" lift?

Here is your quote:
Vtsuby's cylinder head development thread

I finally got the heads rigged up on the flow bench today. We have had issues calibrating the software for the bench but for an initial test I lifted the valves to .450" and saw 235cfm.
Quote:
Originally Posted by VTsuby

Where are you getting 325cfm from I saw 239 messing around with clay at
.450 unless I typed it in wrong.
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Last edited by NeedForSpeed; 02-11-2006 at 02:35 PM.
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  #36  
Old 02-13-2006, 03:48 PM
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Good work. I wasn't able to measure an installed spring height to calculate lift to coil bind, but I did measure cold bind on a spring tester. Both springs with retainer reached coil bind at .850" @135 pounds. Removing the inner spring, the outer spring and retainer reached coil bind at .812" @ 95 pounds, a gain of .038/1mm of travel. So, perhaps the inner spring could be changed [sti piece?], depending on chosen cam lift, etc. Of course there is always the option of fitting completely different valve springs.

If Bill measured .419" lift to coil bind on the intake with inner/outer springs, we could add .038" for a total of .457" lift to coil bind if we could replace the inner spring. Subtracting .050" safety margin, the outer spring with a different inner spring could handle a .400" lift lobe. I measured retainer to valve seal clearance of .450/.455, which is in the same ballpark, also limiting valve lift to approximately .400"/10mm. Intake lobes up to .360" [.390" was Bill's measured exhaust coil bind?/please clarify] should be compatible with stock inner/outer springs and stock valve seal location, providing other clearances are verified.

[QUOTE=SVXRide]Well, I actually found some time to get to my machinist's shop and got the answers to #2 and #3 above (totally phased about #1 I'll probably get this measurement in the next week...)

The clearance between the intake cam lobe and the rim of the lifter bore (using the Delta Cam intake.....oops, is this mike on? ) is greater than .032 inches (~.86mm). The feeler gauge kit we were using maxed out at .032 and it was time to leave so we didn't measure exactly how much clearance there is. There was definitely more room to play with and you can get even more if you just radiused the lobe a little...

As far as lift to coil bind is concerned, we first did a calculation using measurements on the intake valve we've removed (getting ready for some flow work ) and we came up with 0.419 inches (10.63 mm) of lift when the spring binds. We then rigged the head up on a drill press (squaring the valves with the plunger on the press and instrumenting the press with a dial gage). I've included the measurements we got in the picture below. Enjoy!

-Bill
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  #37  
Old 02-26-2006, 08:09 PM
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Quote:
Originally Posted by NeedForSpeed
Retainer to valve seal clearance measurements:
.450" intake
.455" exhaust.

For Harvey's model:
Intake throat 1.220" diameter, 1.060" exhaust throat diameter.
Measured with dial calipers.

I'll second the .450 measurment thats where they bottom out on my fixture with starllet dial gauge
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  #38  
Old 02-26-2006, 08:13 PM
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Definetly wide the throat some especially back side to try to slow the air down alittle which should help it make the corner.
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  #39  
Old 02-26-2006, 09:09 PM
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Ron,
the .390 measurement was on an intake valve....we measured more travel on the exhaust valves...see the figures within the picture I posted earlier.
-Bill
p.s. is everyone ready to gang up on Scott at Delta Cams to get a good exhaust lobe "upgrade" to go with our intake lobe "upgrade"?
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  #40  
Old 02-28-2006, 11:22 AM
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Confirmation is appreciated, thanks

Quote:
Originally Posted by VTsuby
I'll second the .450 measurment thats where they bottom out on my fixture with starllet dial gauge
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  #41  
Old 02-28-2006, 11:25 AM
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That's what I thought you meant. Looks like the stock springs are only good to .340"/350" lift. As I mentioned, the inner spring could be swapped to gain some more.

Quote:
Originally Posted by SVXRide
Ron,
the .390 measurement was on an intake valve....we measured more travel on the exhaust valves...see the figures within the picture I posted earlier.
-Bill
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Last edited by NeedForSpeed; 02-28-2006 at 11:33 AM.
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  #42  
Old 02-28-2006, 11:29 AM
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Bill, an 'upgraded' exhaust lobe would be best determined by exhaust port flow. Let's see what flow numbers are measured by those of you with heads on a flow bench, like yourself and VTSuby.

Quote:
Originally Posted by SVXRide
Ron, is everyone ready to gang up on Scott at Delta Cams to get a good exhaust lobe "upgrade" to go with our intake lobe "upgrade"?
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Last edited by NeedForSpeed; 02-28-2006 at 11:34 AM.
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  #43  
Old 03-01-2006, 08:09 AM
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Quote:
Originally Posted by NeedForSpeed
Bill, an 'upgraded' exhaust lobe would be best determined by exhaust port flow. Let's see what flow numbers are measured by those of you with heads on a flow bench, like yourself and VTSuby.
Ron,
Damn....now the pressure is really on
-Bill
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  #44  
Old 08-06-2006, 07:13 PM
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Next step.

Bill to ensure that we get the results that I am looking for, in this set. We have to rely on Scott to find what profile that he has, that will be closest to the specs that we want.

These are; a duration of about 255* seat to seat/205* at 0.050". 0.350"/8.75 mm lift. The opening and closing ramps should be fast opening, as for a hydraulic lifters.

This cam that he has could be OK, but you should check with him to see if it will fit these specs.

Harvey.
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  #45  
Old 08-06-2006, 10:05 PM
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Quote:
Originally Posted by oab_au
Bill to ensure that we get the results that I am looking for, in this set. We have to rely on Scott to find what profile that he has, that will be closest to the specs that we want.

These are; a duration of about 255* seat to seat/205* at 0.050". 0.350"/8.75 mm lift. The opening and closing ramps should be fast opening, as for a hydraulic lifters.

This cam that he has could be OK, but you should check with him to see if it will fit these specs.

Harvey.
Harvey,
I'll try to make some time to call Scott on Monday. Can you give me a little more to work with here, as the 205 deg at 0.050" appears to be the KA24DE intake (less a degree of duration)? Are we still looking at the KA24DE intake and exhaust profiles as our desired NA2 profiles? The thread has been a little disjointed at times due to the apparent variation within the KA24DE cam "family". Will the "255 deg seat-to-seat" spec be enough of a requirement to drive the "fast opening/closing ramps" aspect here?
Thanks.
-Bill
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Last edited by SVXRide; 08-06-2006 at 10:14 PM.
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