Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features: Join our community! |
| Help! Need stock camshaft specifications.; I can't find these numbers anywhere. | |
|---|---|
| Tweet Topic Started: Sep 2 2012, 09:29 AM (2,410 Views) | |
| 3tech | Sep 5 2012, 08:51 AM Post #31 |
![]()
|
The crower card showed an advertised (this would be your total) D as 233. You can do this: Calculate the events based on the numbers I gave you, then split the difference (233-198/2) and add that to either side of the event, as the lobes are symmetrical or, use the 233 D number along with the centerline info I gave you to figure the events or, do both, and compare. |
![]() |
|
| davegran | Sep 5 2012, 01:04 PM Post #32 |
|
Old Fart w/Wrenches
![]()
|
Hey, thank you very much! That makes perfect sense and gives me the final piece to the puzzle!
|
![]() |
|
| clarkdw | Sep 5 2012, 08:07 PM Post #33 |
![]()
|
I hope that you will be willing to share the info you get from the calculations, particularly the intake runner dimensions. I am working on my next replacement head experiment. Information or calculations based on flowbench tests and performance related software may, or may not, be useful when working on economy tuning. http://geometroforum.com/single/?p=679552&t=4696213 |
![]() |
|
| davegran | Sep 6 2012, 06:22 AM Post #34 |
|
Old Fart w/Wrenches
![]()
|
I'm more than willing to share anything I find, but I'm not working on economy tuning.... I am going to use a 3/5 drivetrain in another vehicle that I intend to build.I hope that you will also give us the benefit of your research and experimentation. |
![]() |
|
| 3tech | Sep 6 2012, 08:07 AM Post #35 |
![]()
|
Let me know how close your header dimensions are to these. I used some software to calculate these a long time ago. 1 3/8" od x 30"-32" length with a 1 3/4"-1 7/8" collector, 10"-12" long |
![]() |
|
| davegran | Sep 6 2012, 06:19 PM Post #36 |
|
Old Fart w/Wrenches
![]()
|
Did you design for peak hp or big torque? |
![]() |
|
| Justahoby | Nov 25 2012, 10:47 PM Post #37 |
|
Unqualified informant
![]()
|
The crower card is all crower specs. Like a cam card is for any other motor when you buy one. Ramps and rate of valve opening/ area under the curve/ opening velocity are not listed with regular camshaft soecs.As in the performance world you can have two different brands , yet operate differently , but have the same advertised duration and/or 0.050. The Crower cam at a 106 centerline and 110 lsa is going to have quite a different characteristic running than the stock 114 intake centerline and 112 lsa .. Tighter lsa brings about more overlap, needed by a small bore long stroke oversquare combo (74x77). This is one of the many reasons the smaller cam usually gets swapped in .. The motor suits lower rpm efficiency. Also a little overlap goes a long way on a tiny motor. More may make better power sooner at the expense of idle efficiency and vacuum . IMHO a 114 intake centerline is actually beginning to be ground retarded rather than advance, which is why many advance these gears 8-10 degrees. This should be no surprise as many vehicles during the era from the mid 70s to mid 90s from v8s to smaller were ground up to 8 degrees retarded to reduce NOx emissions, depending on the size of cam for a given engine ( rod and stroke ratio/ piston dwell, and starting DCR all play factors into the the emissions of NOX) this doesn't however make the motor more efficient but makes it meet the the ignorant EPA standard, ( as opposed to the euro standard that measures quantity of emissions rather than percentage). If I could get my hands on that crower cam , I would use it. It gives a little needed overlap, if you are running good exhaust, and some light porting, and closes the intake soon enough to keep up cranking compression. At 106 intake center I would not advance it ... It is therefore not like stock even though it has been said it is like stock. |
![]() |
|
| j63812f | Oct 28 2013, 09:25 PM Post #38 |
|
J R
![]()
|
|
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| « Previous Topic · Engine Tech & Diagnostics · Next Topic » |


Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.





I am going to use a 3/5 drivetrain in another vehicle that I intend to build.
2:16 PM Jul 11