twiggy cams

[special--k]

Sleepy... i think you are going to go over your $1000 budget... LOL!!

[Packerfan]

Just ordered Integrals thru CP Boost got the Stage 2.5 for the intake and Stage 2 on the exhaust 2 weeks could of ordered straight from Integral but Carlos at CP was very helpful and knowledgeable when it comes to the MSP.

[SleepyMSP]

Sleepy... i think you are going to go over your $1000 budget... LOL!!

hush you

[Crazee D]

FYI...

from http://www.mazdas247.com/forum/showthread.php?t=123663797&page=2

Twiggy Bumpstix - Intake
seat duration =
.050" duration = 221 degrees

Gross cam lift = .341"
Hot valve lash =
Net cam lift = .343"
intake opens 0.8 degrees BTDC
intake closes 40.8 degrees ABDC

Exhaust

seat duration =
.050" duration = 230 degrees
Gross cam lift = .374"
Hot valve lash =
Net cam lift = .375"
exhaust opens 5.9 degrees BTDC

exhaust closes 44.4 degrees ABDC

From the twiggy GB, note the measurements are quoted at .003" lift not .050"

stock cams (us-spec 2L)

intake : 230deg @ 0.003" lift, 8.6487mm lift in total

exhaust : 230deg @ 0.003" lift, 8.1737mm lift in total

stock cams (1.8L)
intake : 225deg @ 0.003" lift, 7.9527mm lift in total
exhaust : 230deg @ 0.003" lift, 8.1737mm lift in total

j-spec intake cam (2L)

241deg @ 0.003" lift, 8.6487mm lift in total

mazdaspeed exhaust cam (2L)
241deg @ 0.003" lift, 8.6487mm lift in total

twiggy cams

intake : 252deg @ 0.003" lift, 8.763mm lift in total

exhaust : 254deg @ 0.003" lift, 9.017mm lift in total

From integrals site:

Seat Duration (.014")

Seat Duration + .003"

.050" Duration

Gross Cam Lift

Stock (intake / exhaust)

254° / 237°

242.2° / 226.7°

214.8° / 198.7°

.342"/.322" (8.69/8.18 mm)

Stage 1	256°	249.4°	217.0°	.346" (8.79 mm)
Stage 2	264°	257.4°	224.8°	.375" (9.52 mm)
Stage 2.5	268°	261.4°	227.9°	.375" (9.52 mm)
Stage 3	272°	265.4°	232.1°	.385" (9.78 mm)

[Outlawstar98]

^I have no clue what any of that means......

haha i Iz noob to motor building.

[Wagonbacker9]

^I have no clue what any of that means......

haha i Iz noob to motor building.

he's quoting lift and duration specs. Duration is measured in degrees of crank rotation, lift in mm... the more of each, the more power you make... up to a point obviously.

*notes possibility for sarcasm in your post... but leaves response up for those who stumble on this and truely haven't a clue*

[Speed3.5]

Not true, we sell custom spec'd Integral Cams to match our SpeedCircuit heads.

Yup, your right.

On another note: what are the "new" parts that could be available soon(summer)

[LordWorm]

he's quoting lift and duration specs. Duration is measured in degrees of crank rotation, lift in mm... the more of each, the more power you make... up to a point obviously.

*notes possibility for sarcasm in your post... but leaves response up for those who stumble on this and truely haven't a clue*

theres a little more to it than that. ramp rate is at least as important (how quickly the valves are opened, and closed, as opposed to how long they are open for (duration) and how far they are opened (lift)). It is possible to have a big cam from an advertised duration/gross lift point of view, that gets killed by a cam with less advertised duration/gross lift but opens the valves more rapidly... it is very difficult to say a cam is good/bad/better than another based on one set of measurements. Unfortunately, most of the time thats all you get....

Also the relationship between lift and duration is important....as well as overlap, exhaust and intake cam advance etc etc.

turbo engines (especially not-so-worked engines....just about anything thats not a race motor) tend to benefit from more lift, where as NA motors tend to enjoy long durations. Of course both are important in either application.

Also, unless you are running a completely insane race motor, low, or no overlap is important for a turbo setup to prevent bleeding boost off through an open exhaust valve on the intake stroke (i believe theres actually negative-overlap on the twiggy cams for FI from memory..could be wrong though).... where as NA will enjoy a larger overlap to assist with scavenging and high RPM breathability.

Then theres the issue of dynamic compression with large cams and so on and so forth...

my point is - its not just a case of looking at the advertised lift and duration in isolation - cams are arguably the most complicated part of the motor to get right.

[Crazee D]

^I have no clue what any of that means......

haha i Iz noob to motor building.

Google is your friend

http://auto.howstuffworks.com/camshaft.htm


Nicely put LW.

[boostdprotegelx]

i have twiggy cams.. i ALMOST considered selling.. rofl. not happening.

[Wagonbacker9]

theres a little more to it than that. ramp rate is at least as important (how quickly the valves are opened, and closed, as opposed to how long they are open for (duration) and how far they are opened (lift)). It is possible to have a big cam from an advertised duration/gross lift point of view, that gets killed by a cam with less advertised duration/gross lift but opens the valves more rapidly... it is very difficult to say a cam is good/bad/better than another based on one set of measurements. Unfortunately, most of the time thats all you get....

Also the relationship between lift and duration is important....as well as overlap, exhaust and intake cam advance etc etc.

turbo engines (especially not-so-worked engines....just about anything thats not a race motor) tend to benefit from more lift, where as NA motors tend to enjoy long durations. Of course both are important in either application.

Also, unless you are running a completely insane race motor, low, or no overlap is important for a turbo setup to prevent bleeding boost off through an open exhaust valve on the intake stroke (i believe theres actually negative-overlap on the twiggy cams for FI from memory..could be wrong though).... where as NA will enjoy a larger overlap to assist with scavenging and high RPM breathability.

Then theres the issue of dynamic compression with large cams and so on and so forth...

my point is - its not just a case of looking at the advertised lift and duration in isolation - cams are arguably the most complicated part of the motor to get right.

yes, I was over simplifying...for that I apologize...

[Kooldino]

Yup, your right.

On another note: what are the "new" parts that could be available soon(summer)

Nothing new in the pipeline other than the turbo kits...but we've been waiting for the manifolds for some time now.

[Ice88]

So what was twiggy getting back to PG about?

Gears or Cams?

[boostdprotegelx]

alright, i am selling my cams. check my fs thread.. or pm me. 675.00 shipped

[special--k]

Anything happen with Ken?