Official Spoon cams info
03-01-2002, 02:15 PM
#1
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No, they're not for sale yet, but I've got some numbers for our technically oriented members who may be interested to see what Spoon's got - and NO, I don't have any power info, and if you ask me "how much power does it make?" instead of "what does the overall power curve look like?" with these cams, I'll smack you 
j/k.
Spoon F20C camshaft spec (IN/EX):
Primary: 33.73/33.43
Secondary: 35.65/35.28
Mid: 36.91/36.66
Central Angle: 113.00/103.00
Action Angle: 256/245
Maximum Lift: 11.53/11.13
UL, Chris, Dan, GTR, et. al may be interested.
UL please note that these numbers are different from the original cam specs listed on this thread: https://www.s2ki.com/forums/showthread.php?...&threadid=15892 that I posted almost a year ago.
j/k.Spoon F20C camshaft spec (IN/EX):
Primary: 33.73/33.43
Secondary: 35.65/35.28
Mid: 36.91/36.66
Central Angle: 113.00/103.00
Action Angle: 256/245
Maximum Lift: 11.53/11.13
UL, Chris, Dan, GTR, et. al may be interested.
UL please note that these numbers are different from the original cam specs listed on this thread: https://www.s2ki.com/forums/showthread.php?...&threadid=15892 that I posted almost a year ago.
03-01-2002, 05:08 PM
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What does the overall power curve look like!!!!!
O.K. seriously, any idea when they are going to be released? Now, only if we could get some inside info. on Toda cams????
O.K. seriously, any idea when they are going to be released? Now, only if we could get some inside info. on Toda cams????
03-01-2002, 06:38 PM
#5
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Hmm, interesting. According to this info, the stock cams are even smaller than I thought (since the previosu #'s were for 11.7/10.6 lift on the Spoon)!
Just for reference, here are the stock #'s compared
-----------------Spoon---------------------------Stock------------------Diff
Primary: 33.73/33.43 33.677/33.716 +0.056/-0.286
Secondary: 35.65/35.28 33.961/33.994 +1.689/+1.286
Mid: 36.91/36.66 36.533/35.928 +0.377/+0.732
Central Angle: 113.00/103.00 Unknown
Action Angle: 256/245 Unknown
Maximum Lift: 11.53/11.13 10.93/9.96 +0.6/+1.17
More peak lift will usually create more power and torque across the rpm range without sacrificing much, if any, low end. More duration will get you more top end, at the expense of low end. Without knowing the duration numbers for stock, its hard to make any major conclusions. But...
The serious increase in lift on the secondary lobes says to me that Spoon is trying to induce some major swirl in the chamber below VTEC. And they're also trying to build more pre-VTEC power by upping lift substantially there. But without knowing duration its hard to know where exactly they're looking to peak in the sub-VTEC rpm range.
There is a slight increase in high lobe intake lift, but not a huge amount. I would expect gains of 5-10 hp from the lift gains, assuming duration stayed the same. If duration is substantially increased, then gains would go up, but so would the power peak. The rather more substantial increase in exhaust lift is interesting and says to me that they want more exhaust flow relative to intake. I'm interested in that because the exhaust side of the head is much easier to improve than the the intake.
Just for reference, Toda Spec A cams for the B-series (so, totally different animals, but still interesting) have specs of 11.6mm/11.2mm and 250/240 duration (action angle :-). They usually produce peak power in the 8000-8500 range on a properly setup 1.8 liter. I suspect that the Spoon cams won't move the power peak much, if at all and I'm betting the duration on the high lobes isn't much longer than stock (in order to preserve torque).
These cams are interesting to me and might be worth trying out. can't wait to see Toda too. Just hoping someone can get me duration specs on the stock cams (so I don't have to figure it out myself :-).
UL
Just for reference, here are the stock #'s compared
-----------------Spoon---------------------------Stock------------------Diff
Primary: 33.73/33.43 33.677/33.716 +0.056/-0.286
Secondary: 35.65/35.28 33.961/33.994 +1.689/+1.286
Mid: 36.91/36.66 36.533/35.928 +0.377/+0.732
Central Angle: 113.00/103.00 Unknown
Action Angle: 256/245 Unknown
Maximum Lift: 11.53/11.13 10.93/9.96 +0.6/+1.17
More peak lift will usually create more power and torque across the rpm range without sacrificing much, if any, low end. More duration will get you more top end, at the expense of low end. Without knowing the duration numbers for stock, its hard to make any major conclusions. But...
The serious increase in lift on the secondary lobes says to me that Spoon is trying to induce some major swirl in the chamber below VTEC. And they're also trying to build more pre-VTEC power by upping lift substantially there. But without knowing duration its hard to know where exactly they're looking to peak in the sub-VTEC rpm range.
There is a slight increase in high lobe intake lift, but not a huge amount. I would expect gains of 5-10 hp from the lift gains, assuming duration stayed the same. If duration is substantially increased, then gains would go up, but so would the power peak. The rather more substantial increase in exhaust lift is interesting and says to me that they want more exhaust flow relative to intake. I'm interested in that because the exhaust side of the head is much easier to improve than the the intake.
Just for reference, Toda Spec A cams for the B-series (so, totally different animals, but still interesting) have specs of 11.6mm/11.2mm and 250/240 duration (action angle :-). They usually produce peak power in the 8000-8500 range on a properly setup 1.8 liter. I suspect that the Spoon cams won't move the power peak much, if at all and I'm betting the duration on the high lobes isn't much longer than stock (in order to preserve torque).
These cams are interesting to me and might be worth trying out. can't wait to see Toda too. Just hoping someone can get me duration specs on the stock cams (so I don't have to figure it out myself :-).
UL
03-01-2002, 07:40 PM
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UL, this is what i got from the Spoon catalog - verbatim:
F20C
Primary: 33.67/33.71
Secondary: 33.96/33.99
Mid: 36.53/35.92
Central Angle: 103.50/99.00
Action Angle: 249/242
Maximum Lift: 11.72/10.66
Spoon
Primary: 33.73/33.43
Secondary: 35.65/35.28
Mid: 36.91/36.66
Central Angle: 113.00/103.00
Action Angle: 256/245
Maximum Lift: 11.53/11.13
Spoon says "designed for mid range torque...better peak power over normal peak limits..." (rough translation).
F20C
Primary: 33.67/33.71
Secondary: 33.96/33.99
Mid: 36.53/35.92
Central Angle: 103.50/99.00
Action Angle: 249/242
Maximum Lift: 11.72/10.66
Spoon
Primary: 33.73/33.43
Secondary: 35.65/35.28
Mid: 36.91/36.66
Central Angle: 113.00/103.00
Action Angle: 256/245
Maximum Lift: 11.53/11.13
Spoon says "designed for mid range torque...better peak power over normal peak limits..." (rough translation).
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03-01-2002, 08:14 PM
#9
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Oooh, I see. I was assuming that Spoon used the same base circle as Honda. But in reality, their base circle is about 30.5mm, or about 0.5mm bigger than stock. That explains things, although I'm not sure why they'd do that, sure makes the valve adjustment quite a bit different.
I'm not sure why they'd reduce lift but increase duration on the big lobes. That will actually move the curve up a bit in my experience, but since that only happens on the intake side...
Hmm, not sure I'd want these for my driving style then. I'll wait till someone else dynos them :-)
UL
I'm not sure why they'd reduce lift but increase duration on the big lobes. That will actually move the curve up a bit in my experience, but since that only happens on the intake side...
Hmm, not sure I'd want these for my driving style then. I'll wait till someone else dynos them :-)
UL