Corvette Forum : DigitalCorvettes.com Corvette Forums banner

Status
Not open for further replies.
1 - 3 of 3 Posts

·
Super Moderator
Joined
·
8,480 Posts
Discussion Starter #1
setting up a cam CORRECTLY

FIRST YOULL NEED TO KNOW HOW TO READ A SPEC. CARD, heres a few typical ones
http://www.crower.com/misc/cam_spec/cam_finder.php?part_num=00383&x=52&y=6

http://dab7.cranecams.com/SpecCard/DisplayCatalogCard.asp?PN=114681&B1=Display+Card
http://www.compcams.com/information/search/CamDetails.asp?PartNumber=12-771-8
http://www.cranecams.com/spechowto.htm

things to read, (YEAH SOME IS INFO ON PONTIACS BUT THEY ARE CLOSE ENOUGHT THAT YOULL STILL LEARN!)

read
http://www.newcovenant.com/speedcrafter/tech/camshaft/1.htm

lessons 1-8
http://www.boyleworks.com/ta400/psp/camshaft.html
http://www.jimcookperformance.com/TechNotes/TN6DegCam.html

BUT KEEP IN MIND everyone makes mistakes INCLUDEING THE GUYS MAKING CAMS AND TIMING GEAR SETS and if your like me , for several years I installed cams at the factory marked setup points and only occasionally had engines not run quite as well as I thought they should.
we let me say this , since I started checking things carefully with a dial indicator I find just how sloppy the manufacturers tollerances are and that engines are fairly tollerant of running cams that are ground a few degrees off what the spec card SAYS the SPECS are. but be prepared for a shock at just how loose some manufacturers are at matching the cam to the posted specs.

if your still interested heres instructions and tools priced reasonably



http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3292&prmenbr=361

heres just the video if you have the tools already

http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=30669&prmenbr=361


http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3293&prmenbr=361

or if you want written instructions
BTW I have both of these degree wheel, the larger 18" moroso wheel is great with the engine on an engine stand but the smaller size is mandatory IN an ENGINE COMPARTMENT

http://www.thedirtforum.com/degree.htm

http://www.hotrodder.com/kwkride/degree.html

good info to know

http://www.symuli.com/vw/camp1.html

http://www.symuli.com/vw/camp2.html


http://www.chevyhiperformance.com/techarticles/95298/

now Im assumeing you did your research and got what both you and your cam company of choice think is the correctly matching cam for your application!

(1) make sure the cam youve installed matches the specs on the card
(2)if after running the engine you feel that moveing the torqur curve up or down in the engines rpm range will be of benefit to you , retarding it tends to move the torrque peak upward about 100rpm for each 2 degrees of retard, (ID stay within 6-7 degrees of the SPLIT OVERLAP POINT BTW) advanceing the cam 2 degrees tends to lower the torque peak s rpm by that same 100rpm for each 2 degrees, if you need to go more than 6-7 degrees YOU REALLY NEED A DIFFERANT CAM

(1)you must always check CLEARANCES
(2) many cams are already ground 4 degs advanced
(3) if you need to advance or retard a cam more that about 7-8 degrees MAX [color:"red"]FROM THE SPLIT OVERLAP POINT you WILL BE way better off with a differant cam

(4) displacement, stroke clearances and rod length ,ETC,DO have an effect on the results

http://www.chevytalk.org/threads/showflat.php?Cat=&Board=UBB64&Number=291865&Forum=UBB64&Words=lifter%20bore&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=3months&Main=291065&Search=true#Post291865

http://www.cranecams.com/instructions/degreeing/degree.htm

http://www.cranecams.com/instructions/degreeing/degree1.htm

http://www.cranecams.com/instructions/degreeing/degree2.htm
(4) displacement, stroke clearances and rod length ,ETC,DO have an effect on the results

(5) if your in doubt,while picking between two similar cams, always go with slightly lower duration and a wider LSA , you might loose some hp/tq but youll be slightly less likely to get into problems with detonation and bad idle if the specs are very similar
 
1 - 3 of 3 Posts
Status
Not open for further replies.
Top