read DMs/my profile login | join CAFords | search | faq |

» Northern California Ford Owners     » Automotive   » Tech Talk   » Cams hurting power? (Page 1)

Email this post to someone!

Page: 1  2

Author Topic: Cams hurting power? Elapid GOROBGO Member # 50 posted                                 not sure if that's really possible, but i was wondering about using stage 3 cams on a stage 1 build motor... any input? specifically, i have the same cams that John Mihovetz uses in this car inside my DOHC motor... overkill? surely. will it hurt? ???? [ November 12, 2003, 12:19 PM: Message edited by: Elapid ] -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : JoeT ¯ Member # 298 posted                                 I'm sure the same cam for a 1800 HP motor can be used in your street car, why not it probably has the same airflow requirements right? -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : Elapid GOROBGO Member # 50 posted                                 it seems to run ok... got anything specific? i actually put in the cams looking toward the future. the motor can handle a lot more power than i'm putting to it at the moment, and i do plan on pumping up the volume a bit, but want to wait until i get a few more mods. as it is, the car needs a cage, etc. to be track-legal so putting any more power in doesn't make any sense, really... [ November 12, 2003, 01:19 PM: Message edited by: Elapid ] -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : stoauto ¯ Member # 2803 posted                              [ November 12, 2003, 01:19 PM: Message edited by: stoauto ] Posts: 1054 | Registered: May 2003  |  : stoauto ¯ Member # 2803 posted                              [ November 12, 2003, 01:32 PM: Message edited by: stoauto ] Posts: 1054 | Registered: May 2003  |  : Elapid GOROBGO Member # 50 posted                                 well, i wouldn't think about it in terms of comparing my output to john's really... i would think about it in terms of stock cams-vs- SHM blower cams (reground stock sticks) actually john prolly uses billet cams now not these sticks, but he used to use these and was putting down similar numbers. -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : stoauto ¯ Member # 2803 posted                              [ November 12, 2003, 01:27 PM: Message edited by: stoauto ] Posts: 1054 | Registered: May 2003  |  : stoauto ¯ Member # 2803 posted                              i'm just giving you a hard time bro, i hope your car hauls ASS!!!! -Evan definately post the outcome, if you get your car dynoed or whatever. Posts: 1054 | Registered: May 2003  |  : Elapid GOROBGO Member # 50 posted                                 here are the specs: Left Intake Cam Timing .050 Opens 10 ATDC Closes 39 ABDC Centerline 114.5 Duration 209 Valve lift .472 Left Exhaust Cam Timing .050 Opens 40 BBDC Closes 5 ATDC Centerline 107.5 Duration 225 Valve lift .452 Right Intake Cam Timing .050 Opens 10 ATDC Closes 39 ABDC Centerline 114.5 Duration 209 Valve lift .472 Right Exhaust Cam Timing .050 Opens 40 BBDC Closes 5 ATDC Centerline 107.5 Duration 225 Valve lift .452 i'm running 14 psi of boost, not 30 psi, but boost is boost, right? -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : stoauto ¯ Member # 2803 posted                              SHIIIIIIT ALL THESE DOUBLE POST, SORRY damn thats it, i thought the cams would be alot bigger, but hey man thats fucken sweet. i'd like to hear that. i figure your car should make some good power, but what do i know. Posts: 1054 | Registered: May 2003  |  : Elapid GOROBGO Member # 50 posted                                 i have been running these cams for several thousand miles now. i really love the feeling when it gets into the power band! I'm running the (Mihovetz) Accufab (large throat, single-blade) Throttlebody that i can stick my whole hand in which is really made for a much more powerful motor. here's a pic of the motor when they pulled it to fix an exhaust leak specs: SHM 575 shortblock including manley forged rods forged pistons arp studs everywhere including heads SHM Blower cams Canton racing pan w/windage Ported heads (just some pocket work) stock intake Accufab Throttlebody JBA Cat4Ward headers still needs: main girdle billet oil pump gears aluminum flywheel sfi spec balancer (on my floor) short-runner intake IMRC deletes (on the shelf in the garage) [ November 12, 2003, 01:53 PM: Message edited by: Elapid ] -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : stoauto ¯ Member # 2803 posted                              DAMN sweet, how much power are you trying to make? Posts: 1054 | Registered: May 2003  |  : Elapid GOROBGO Member # 50 posted                                 it put up SAE 450HP/380TQ at the wheels last November and ran 11.84 @ 122.4 in the summer heat i plan to up the ante to 600+ rwhp once i get a tranny that can take the abuse, etc. [ November 12, 2003, 01:40 PM: Message edited by: Elapid ] -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : stoauto ¯ Member # 2803 posted                              NICE! Posts: 1054 | Registered: May 2003  |  : Glenn ¯ Member # 520 posted                              I was told by a motor builder that too big of a cam can hurt power. That is why I am swapping mine out. I'll let you know how it goes when the install is done, if it helped to go with a smaller cam. -------------------- S-Trim,331,H/C/I "JohnB groupie train" My Car DragGuam Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001  |  : Elapid GOROBGO Member # 50 posted                                 smaller in what way? i think lift is pretty limited on these beasties due to tight clearances, do you mean shorter duration or less overlap? anyone know what stock lift is? -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : Elapid GOROBGO Member # 50 posted                                 so, shade- you seem to know a lot. what part of my cam profile is hurting my power? lift? duration? overlap? something else? -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : Elapid GOROBGO Member # 50 posted                                 anyone have a real clue or am i only entitled to sarcasm? -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : AaronC ¯ Member # 86 posted                              Just looking at the specs it's REALLY exhaust biased. 16 degrees difference at .050. Boosted or not I don't think YOU need anywhere near that much. The guy that's running them with 30 psi is not only running more boost but I'm sure his compressor is much bigger. Would you happen to know the specs of the stock cams? I'd think something in the single pattern to very slight exhaust bias would work well for a typical boosted 4v Cobra. -------------------- 1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers 12.23 at 112.99 Best MPH 113.97 Posts: 776 | From: woodland | Registered: Dec 2000  |  : Elapid GOROBGO Member # 50 posted                                 so how about installing the exhaust cams slightly advanced (?) to compensate? i don't have stock cam specs. i looked on the web a bit, but didn't find anything. thanks for the reply, aaron! -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : AaronC ¯ Member # 86 posted                              Advancing it would compound the problem. I think it has too much exhaust. But that's speculation on my part. Try to find out what the stock specs are so you can compare them. Then compare outputs of your car vs. a Cobra with similar mods. Go from there... IMO I guess you have a few options. 1) Either change the exhaust cams for ones that match the intake a little better or vise versa. 2)Put stock ones back in. 3) Buy new ones. 4) Or up the boost. 5) say fuck it, it makes plenty of power as is and leave it alone [ November 14, 2003, 04:06 PM: Message edited by: AaronC ] -------------------- 1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers 12.23 at 112.99 Best MPH 113.97 Posts: 776 | From: woodland | Registered: Dec 2000  |  : JoeT ¯ Member # 298 posted                                 (1) vote for trying the stock cam. Have you ever done that with your current setup? I don't think I should comment on duration since I don't follow 4cam modulars though other than to say "hey thats neat" -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : JoeT ¯ Member # 298 posted                                 or perhaps you could just reinstall your stock exhaust cam(s) or whichever stock cam has the most duration in the exhaust cam(s) location (hope that makes sense) [ November 14, 2003, 04:02 PM: Message edited by: shade- ] -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : Elapid GOROBGO Member # 50 posted                                 i took a look at the SHM cam page, http://www.seanhylandmotorsport.com/mustang_svt_cobra_pg1_2_1.shtml it's not far off their stage 2 camset but the blower cams have the same lift as the stage 1. exhaust duration is the same for the blower cam and the stage 2 n/a cam. i'm not really planning on doing anything, i'm just trying to gain a better understanding of my setup. i'm planning on a 75-shot of juice once i get everything in order. [ November 14, 2003, 04:15 PM: Message edited by: Elapid ] -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : 93PONY Mr. Valve Events Member # 60 posted                           You're running stock exhaust manifolds right? So...the added exhaust isn't hurting you that much. Stock cams are tiny. I say leave it alone...or perhaps install longtubes, but new cams is not worth the $$$. (4 billet cams at $300-$400 each!) -------------------- www.advancedenginedevelopment.com SCT dealer Dynotuning (916)715-7569 Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000  |  :

Page: 1  2

Printer friendly view of this Ford topic

Hop To: Select a Forum: Category: Automotive -------------------- Tech Talk Drag Racing Road Racing, Auto X & Drifting Events/Shows/Cruises General Talk Street Racing Category: Commerce -------------------- FOR(D) SALE: non-automotive classifieds Vendor's FOR SALE Section

Questions/Requests/Suggestions? email CAFords



Fueled by Ford Mustang Owners
on CaliforniaFords.com