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H.D.
Captive Ball Valve Adj.
Cam's
& valves
Above are three cams, Can you guess which one has the largest Duration and Lift
The point we are trying to make is that all three cams
have the same lift (L)
and duration
(D).
As you can see they are
obviously not even close to being the same.
If cam "B" is
the correct design then cam "A" would
have more Low End but produce less H.P.
and be more likely to float the
valves.
Cam "C" would have lots of Top End but would produce a
very narrow power band and be very
hard on the valve train since the
valves would be opening so fast,
As you can see it is nearly impossible to compare or evaluate cams by the "numbers" only.
So when it comes time to pick a cam it is wise to get advice from some one who has tried a verity of cams in motor's similar to the one you will installed it in.
Stock cams as used in the 1200cc
to1600cc VW motor had about 225 degrees duration & 285/300
lift this comes out about .214°@.050" and .334" valve lift with
stock 1.1:1 rockers..(1200 used 1:1 rockers).
"advertised" duration would be 250°
Most new engine builders have a tendency to over cam there first several
motors, First time engine builders are warned about " Over
C's " It's very easy to Over Cam, Over Carb
and Over Compression until your on your 4th or 5th motor.
We give the following Rule of Thumb suggestion on picking
your first cam. And we realize that every "Rule of Thumb" is
made to be broken, but please don't go wild until you gain some experience
building VW motors. Please Note that this is the Maximum Recommended
for the type carburator your running and not likely the Ideal cam for your
motor. We normally find we like around 270 degrees duration for our
street cars and our Stock 1600cc class motor won a lot of races with 274
degree duration cam.
One Carb with Dual throats .........Maximum Duration of 285 degrees
Dual Carbs ( The carb's do not limit duration as with single carb use. )
It makes absolutely no sense to build a motor with a stock crank, that should not be revved over 5000 rpm and then put a cam in it that performs best at 6000 or more RPM. Even an all out race motor used for off road needs lots of torque in the lower RPM not a couple of extra horses at the end of the longest straight.
If you need help picking a cam, first gather up as much information as you can, and then head out to your local engine builder. Remember you wont necessarily get the correct information from man down the street who has the fastest VW in town. Better find out who built his motor and take all your information to the experienced motor builder.
If you are on a tight budget you might be considering a reground
cam and lifters. My opinion is to save money some place else. When a cam
is reground the base circle gets smaller and smaller and when
reground lifters are also used the lifter starts coming out of the lifter
bore. We won't even get into the surface hardness of the cam and lifters.
Use a New Cam and Lifters break it in as recommended.
Check Out the Cam card that came with the cam as it gives some
important information. Ok we all know .420Lx276D is Lifting the valve
.420" and the 276D is the numbers of Degrees the cam keeps the valve
open. Now some cams also show the Duration at .050" This is because
some cam grinders have a very slow ramp getting the valve started and some
use a short ramp. The W100 Engle cam below uses 15' to get the valve
open the first .050" & another 15' to ease it closed
on the seat. Now the TCS 30 Turbo cam uses 0ver 20' to move the valve the
first .050" You will also see the Lobe centers like 108' and
some listed like 284/276. These are the split Duration cams. (We would recommend
leaving these to the experienced engine builder) We find it a lot easer
to experiment with different rockers on Exhaust and intake valves. We
have had some motors that really like a 1:1 rocker on the Ex. & 1.25
to 1 on the intake valve. Don't be fooled by the head shop that
list the flow at 1.5" or some ridicules valve lift. And the
"Fast Freddy" engine builder that always recommends hi lift
rockers. Same goes for Extra large Ports & bigger valves. Building
a motor with good torque is a lot different then building a drag motor
that wont pull away from a stop light below 5000 RPM.
ENGLE Camshafts
Engle Cam W100 .420L/276 Degrees
Duration
Engle Cam W110 .430L/284 Degrees
Duration
Engle Cam W120 .435L/294 Degrees
Duration
Engle Cam W125 .460L/301 Degrees
Duration
Engle Cam W130 .460L/308 Degrees
Duration
Engle Cam W140 .465L/313 Degrees
Duration
Engle Cam VZ14 .462L/274 Degrees
Duration
Engle Cam VZ15 .478L/279 Degrees
Duration
Engle Cam VZ25 .470L/286 Degrees
Duration
Engle Cam VZ30 .507L/298 Degrees
Duration
Engle Cam VZ35 .490L/309 Degrees
Duration
Engle Cam FK7 .500L/288 Degrees
Duration
Engle Cam FK8 .534L/298 Degrees
Duration
Engle Cam FK10 .539L/310 Degrees
Duration
Engle Cam FK43 .536L/281 Degrees
Duration
Engle Cam FK65 .478L/280 Degrees
Duration
Engle Cam FK89 .582L/328 Degrees
Duration
Engle Cam FK97 .622L/328 Degrees
Duration
Engle Cam FK98 .624L/332 Degrees
Duration
Engle Cam TCS 10 TURBOCAM 284/276D X .430/.420 Lift
Engle Cam TCS 20 TURBOCAM 294/284D X .435/.430 Lift
Engle Cam TCS 30 TURBOCAM 308/294D X .460/.435 Lift
SCAT Camshafts
T-1 CAM C20 .338in Lift X 278 Degrees
Duration
T-1 CAM C25 .385in Lift X 275 Degrees
Duration
T-1 CAM C35 .410in Lift X 286 Degrees
Duration
T-1 CAM C45 .418in Lift X 296 Degrees
Duration
T-1 CAM C55 .428in Lift X 312 Degrees
Duration
T-1 CAM C65 .440in Lift X 318 Degrees
Duration
T-1 CAM C75 .445in Lift X 342 Degrees
Duration
T-1 CAM C85 .574in Lift X 330 Degrees
Duration
T-1 CAM C95 .475in Lift X 286 Degrees
Duration
T-1 CAM C89 .618in Lift X 325 Degrees
Duration
T-4 CAM .415in Lift X 278 Degrees
Duration
T-4 CAM .473in Lift X 275 Degrees
Duration
T-4 CAM .503in Lift X 286 Degrees
Duration
Eagle Cam Sold by CB
2229 Cam - Advertised Duration 260° and Duration. at .050" is 216° / Lift
at cam .299"
2230 Cam - Advertised Duration 264° and Duration at .050" is 220° / Lift
at cam .301"
2231 Cam - Advertised Duration 268° and Duration at .050" is 228° / Lift
at cam .313"
2232 Cam - Advertised Duration 262° and Duration at .050" is 230° / Lift
at cam .360"
2233 Cam - Advertised Duration 272° and Duration at .050" is 234° / Lift
at cam .371"
2234 Cam - Advertised Duration 274° and Duration at .050" is 234° / Lift
at cam .387"
2235 Cam - Advertised Duration 270° and Duration at .050" is 236° / Lift
at cam .374"
2236 Cam - Advertised Duration 280° and Duration at .050" is 236° / Lift
at cam .339"
2237 Cam - Advertised Duration 278° and Duration at .050" is 244° / Lift
at cam .421"
2238 Cam - Advertised Duration 274° and Duration at .050" is 236° / Lift
at cam .319"
2239 Cam - Advertised Duration 276° and Duration at .050" is 234° / Lift
at cam .380"
2240 Cam - Advertised Duration 286° and Duration at .050" is 248° / Lift
at cam .430"
2241 Cam - Advertised Duration 286° and Duration at .050" is 240° / Lift
at cam .386"
2242 Cam - Advertised Duration 298° and Duration at .050" is 248°
/ Lift at cam .389"
2243 Cam - Advertised Duration 306° and Duration at .050" is 250° / Lift
at cam .424"
2244 Cam - Advertised Duration 300° and Duration at .050" is 250° / Lift
at cam .370"
2245 Cam - Advertised Duration 318° and Duration at .050" is 270° / Lift
at cam .393"
2246 Cam - Advertised Duration 314° and Duration at .050" is 260° / Lift
at cam .411"
2247 Cam - Advertised Duration 328° and Duration at .050" is 278° / Lift
at cam .410"
2248 Cam - Advertised Duration 318° and Duration at .050" is 276° / Lift
at cam .401"
2249 Cam - Advertised Duration 326° and Duration at .050" is 280° / Lift
at cam .405"
2250 Cam - Advertised Duration 296° and Duration at .050" is 256° / Lift
at cam .420"
2280 Cam - Advertised Duration 274° and Duration at .050" is 222° / Lift
at cam .359"
Eagle Drag Racing Cams Sold by CB
2288 Cam (K-8) Advertised Duration 308° and Duration at .050" 256° / Lift
at cam .378" / Lift w/1.1:1 Rocker Arms .415" / Lift w/1.25:1 .473" / Lift w/1.4:1 .529" / Lift w/1.5:1 .567"
2289 Cam (FK-87) Advertised Duration 322° and Duration at .050" 274° / Lift
at cam .398" / Lift w/1.1:1 Rocker Arms .437" / Lift w/1.25:1 .498" / Lift w/1.4:1 .557" / Lift w/1.5:1 .597"
2295 Cam Advertised Duration 314° and Duration at .050'' 270° / Lift at cam .415'' / Lift w/1.1:1 Rocker Arms .456'' / Lift w/1.25:1 .518'' / Lift w/1.4:1 .581'' / Lift w/1.5:1 .622''
2296 Cam Advertised Duration 320° and Duration at .050'' 280° / Lift at cam .424'' / Lift w/1.1:1 Rocker Arms .466'' / Lift w/1.25:1 .530'' / Lift w/1.4:1 .593'' / Lift w/1.5:1 .636''
2297 Cam Advertised Duration 332° and Duration at .050'' 288° / Lift at cam .435'' / Lift w/1.1:1 Rocker Arms .478'' / Lift w/1.25:1 .543'' / Lift w/1.4:1 .609'' / Lift w/1.5:1 .652''
2298 Cam (FK-89) Advertised Duration 328° and Duration at .050" 278° / Lift
at cam .407" / Lift w/1.1:1 Rocker Arms .447" / Lift w/1.25:1 .509" / Lift w/1.4:1 .570" / Lift w/1.5:1 .611"
2299 Cam (FK-97) Advertised Duration 322° and Duration at .050" 284° / Lift
at cam .435" / Lift w/1.1:1 Rocker Arms .478" / Lift w/1.25:1 .544" / Lift w/1.4:1 .609" / Lift w/1.5:1 .653"
Web Cams
Grind # 86 - Cam .358 Lift x 270 Degrees
Duration
Grind # 111 - Cam .476 Lift x 272 Degrees
Duration
Grind # 119 - Cam .422 Lift x 276 Degrees
Duration
Grind # 218 - Cam .455 Lift x 280 Degrees
Duration
Grind # 118 - Cam .402 Lift x 283 Degrees
Duration
Grind # 163 - Cam .422 Lift x 284 Degrees
Duration
Grind # 110 - Cam .435 Lift x 284 Degrees
Duration
Grind # 218/119 - Cam .455/.422 Lift x 280/276 Degrees
Duration
Grind # 110/163 - Cam .435/.422 Lift x 284 Degrees
Duration
Grind # 109/119 - Cam .465/.422 Lift x 287/276 Degrees
Duration
Grind # 109 - Cam .465 Lift x 287 Degrees
Duration
Grind # 122/125 - Cam .506/.478 Lift x 288 Degrees
Duration
Grind # 121 - Cam .490 Lift x 298 Degrees
Duration
Cam Bearings, Std, & Special See #26 on -->
*Click
Valve Train & Cam Gears - *ck
AP Performance Cams -> Order
New 36hp cam -> Order
Push Rod Tubes "Replacement type"-> Order
Engle W120 Cam 294 Dur. & 437 Lift
--> "Quote"
$69.95
W100 Cam 276 Dur. x 420
Lift --> "Quote"
$69.95
Engle Cam 274 Dur. & 462 Lift
--> "Quote"
$69.95
1.25 Ratio Rockers clam 10% more Horsepower ->
Order