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Valve lash adjustment on solid Compcam

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Author	Topic: Valve lash adjustment on solid Compcam
Pierre Gearhead Posts: 541 From: Near Paris, France Registered: Apr 2002	posted 01-14-2004 11:12 AM 3000 miles into my new engine, and getting ready to check valve lash on my 270S. Compcam gives 0.022, engine hot, can I go a little tighter than that (I don't exceed 6500 RPM)? ...as it seems like a big gap to me If yes, by how much ? IP: Logged
SteveLaRiviere Administrator Posts: 42859 From: Saco, Maine Registered: May 99	posted 01-14-2004 02:21 PM I'd be inclined to trust the engineer's recommendations. They are the ones that know the metallurgy and did the math. JMHO ------------------ '70 Mustang Mach 1 351C 4V/FMX/3.25 Open '70 Mustang Convertible 250 I6/3 speed/2.79 Open '72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc '94 F-150 XL 5.8L/E4OD/3.55 Limited Slip IP: Logged
Moneymaker Administrator Posts: 25539 From: Lyons, IL, USA Registered: May 99	posted 01-14-2004 03:28 PM You can safely go +- .005 easily. .005 tighter will give you smoe more top end power. .005 looser will give you more bottom end. Comp by design has a tendancy to recomend tighter lashes overall. Strange but true. The recomended lash on MM's .800+ lift cam is .024 and .026 We have found that it prefers .034 I usually set up 270S's at .030 accross. Hint, hint, to 270S users ------------------ Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver MCA member# 53321 NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03 First SS/MA in the TENS! IHRA division 5 Superstock Champion Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked." Quote #2: "Make sure brain is in gear before engaging mouth!" Quote #3: "If you can't run with the big dogs, stay on the porch!" www.moneymakerracing.com IP: Logged
V8 Thumper Gearhead Posts: 4376 From: Arizona Registered: Dec 2001	posted 01-14-2004 03:53 PM quote: Originally posted by Moneymaker: I usually set up 270S's at .030 accross. Hint, hint, to 270S users Would a 282S respond with similar results? ------------------ 1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle http://mustangsandmore.50megs.com/V8Thumper.html IP: Logged
Moneymaker Administrator Posts: 25539 From: Lyons, IL, USA Registered: May 99	posted 01-14-2004 06:19 PM In your case I would tighten them up .005. ------------------ Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver MCA member# 53321 NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03 First SS/MA in the TENS! IHRA division 5 Superstock Champion Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked." Quote #2: "Make sure brain is in gear before engaging mouth!" Quote #3: "If you can't run with the big dogs, stay on the porch!" www.moneymakerracing.com IP: Logged
V8 Thumper Gearhead Posts: 4376 From: Arizona Registered: Dec 2001	posted 01-14-2004 06:24 PM Thank you ------------------ 1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle http://mustangsandmore.50megs.com/V8Thumper.html IP: Logged
Pierre Gearhead Posts: 541 From: Near Paris, France Registered: Apr 2002	posted 01-15-2004 03:11 AM quote: Originally posted by Moneymaker: You can safely go +- .005 easily. .005 tighter will give you smoe more top end power. .005 looser will give you more bottom end. Comp [b]by design has a tendancy to recomend tighter lashes overall. Strange but true. The recomended lash on MM's .800+ lift cam is .024 and .026 We have found that it prefers .034 I usually set up 270S's at .030 accross. Hint, hint, to 270S users [/B] I sure did not expect that answer but thinking about it, it makes a lot of sense Will go .030" Thanks again IP: Logged
Pierre Gearhead Posts: 541 From: Near Paris, France Registered: Apr 2002	posted 01-15-2004 09:57 AM quote: Originally posted by V8 Thumper: Would a 282S respond with similar results? Did you swap the 270S ? .....You just couldn't help it right ! Tell me how it runs, is it streetable (idle, vaccum,.....) as I am getting the same itch IP: Logged
V8 Thumper Gearhead Posts: 4376 From: Arizona Registered: Dec 2001	posted 01-15-2004 10:38 AM Oh yea I swapped cams a few months ago. It changed the motor's character a bunch It sofened the low-end grunt a bit (which is good, helps to keep from blowing the tires off the wheels ). From 3k and up, HOLD ON ------------------ 1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle http://mustangsandmore.50megs.com/V8Thumper.html IP: Logged
V8 Thumper Gearhead Posts: 4376 From: Arizona Registered: Dec 2001	posted 01-15-2004 11:03 AM With a four speed and non-power brakes, it is streetable. Way too much for a stock converter and tall gears however. Fuel milage really sucks ... small price to pay It'd probably get much better fuel economy if I could keep my right foot off of the floor ------------------ 1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle http://mustangsandmore.50megs.com/V8Thumper.html IP: Logged
Pierre Gearhead Posts: 541 From: Near Paris, France Registered: Apr 2002	posted 01-15-2004 11:48 AM quote: Originally posted by V8 Thumper: With a four speed and non-power brakes, it is streetable. Way too much for a stock converter and tall gears however. Fuel milage really sucks ... small price to pay It'd probably get much better fuel economy if I could keep my right foot off of the floor Yeah that's the thing ! I am already down to 14-15 mpg (at best) with the 270S (driving reallllly nice)! Cost me a quarter $ per mile already to run this thing .....I really need another mustang that's what I should do: one for adrenaline rush and one for long hall trips IP: Logged
V8 Thumper Gearhead Posts: 4376 From: Arizona Registered: Dec 2001	posted 01-15-2004 12:10 PM quote: Originally posted by Pierre: 14-15 mpg (at best) I don't get half that ------------------ 1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle http://mustangsandmore.50megs.com/V8Thumper.html IP: Logged
Pierre Gearhead Posts: 541 From: Near Paris, France Registered: Apr 2002	posted 01-15-2004 12:13 PM quote: Originally posted by V8 Thumper: I don't get half that I bet Texaco's stock goes up anytime you open your garage door IP: Logged
n2oMike Gearhead Posts: 2395 From: Spencer, WV Registered: Jan 2001	posted 01-15-2004 06:41 PM I always ran 0.017" intake and 0.020" exhaust on Comp Magnum solids. The first one had a 270S intake and 282S exhaust lobe. The cam used in my sig below was the 282S intake lobe and the 294S exhaust. Tighter lash makes a lot less noise, and is easier on the rocker arm rollers and valve tips. Good Luck! ------------------ Mike Burch 66 mustang real street 302 4-speed 289 heads 10.63 @ 129.3 http://www.geocities.com/carbedstangs/cmml_mburch.html http://www.fortunecity.com/silverstone/healey/367 http://www.mustangworks.com/cgi-bin/moi-display.cgi?220 IP: Logged

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