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CAMS & SPRINGS 

 

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 Post subject: CAMS & SPRINGS
Posted: Wed Feb 15, 2006 8:02 pm 
Stock as a Rock
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Hey guys getting closer to doing my cam, head and intake swap. Just wanting to be sure bout cam selection and whether i can get away with stock springs. Am almost certain on getting crane 2031 cam, can i use stock springs?? Not intending on revving over 6000rpm?

I had a look a my heads the other day gt40p and noticed the very small exhaust ports.... should i bother getting them cleaned up a little or not worth the worry??

I know this stuff gets talked about alot but i needed to know personaly..thanks :D

 

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EF XR8 5spd: 302ci /178rwkw

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Posted: Wed Feb 15, 2006 9:23 pm 
Getting Side Ways
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Look down the page this has been bought up before...Search is your friend....
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Forums / my pofile

 

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As in ZOOM 126 edition
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Posted: Wed Feb 15, 2006 11:02 pm 
Getting Side Ways
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Stock springs are barely good enough for the stock cam IMO, not to mention the extra lift and harsh ramp rates of the 2031 and similar cams.

As mentioned there is a lot on GT40P heads and the benefits in porting, IMO it's not worth it in the majority of cases. They flow enough for most 5L setups, becoming a restriction around 180rwkw or so, and the money spent porting the GT40P's would be better spent on some aftermarket alloys if you needed the flow.
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Posted: Wed Feb 15, 2006 11:22 pm 
Tyre Shredder
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WHS ^^^

Plus you didn't mention if you had roller rockers.

The stock pressed steel ones won't last long with an aggressive cam. :x

 

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Posted: Sat Feb 18, 2006 10:05 pm 
Getting Side Ways
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thats right....ive learnt from experience....stock springs with a cam dont last - especially if you like to rev the engine past 5000rpm on a regular basis....
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Posted: Sun Feb 19, 2006 12:17 am 
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Had a B303 cam with a fully stock engine for years and never had any problems. Although the B303 is more of a long duration cam rather than a real high lifter.

 

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Posted: Sun Feb 19, 2006 8:00 am 
Getting Side Ways
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I have the Crane 2031, and my aftermarket single springs didnt even last.

Get doubles...

or your up for a hefty repair bill when they break.

(or like me... you just use that as an excuse to get nice new alloy heads when they break)

 

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1993 ED XR8 - Poly Green, AFR 185 Alloy heads, Edlebrock Performer RPM Manifold, Crane 2031, T56 6 Speed, 3.9 diff, = 205.7 rwkw.
1993 ED Fairmont - Cobalt Blue, 5L, 17" CSA's and not much else.
1969 Mustang Fastback - Gunmetal Grey, 302, Auto, LHD. Doesn't go very hard, but looks sexy as !

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Posted: Sun Feb 19, 2006 2:00 pm 
Getting Side Ways
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Yep one of the quickest ways to drop a valve and destroy engine...Std valve springs have been known to break with std cam etc...Plus runing std springs fatigues the crap out of other components..Being valve stem and seats due to hammering from bouncing valve...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Sun Feb 19, 2006 8:32 pm 
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I'm looking at the crane springs that are recomended for the 2031. The part no is:(99841-16) single springs with damper??? These fit the heads without any machining, the doubles part no is :(99838-16) but require machining,wat does everyone think? :?

 

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Posted: Sun Feb 19, 2006 8:36 pm 
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doubles

 

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Posted: Sun Feb 19, 2006 10:35 pm 
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I bought those Crane singles and I broke one after about 30,000kms. Luckily I wasn't getting up it at the time, i was basically idleing, so it did no other damage.

Get the doubles.

I believe there are some Comp Cams doubles that fit without requiring machining. Not 100% sure though.
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Posted: Mon Feb 20, 2006 1:14 pm 
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Location: perth
WA, Australia

Consider using these with 2031

Comp Springs #978.
installed: 126lbs @ 1.850 in.
open : 368lbs @ 1.250in.
spring rate : 403 lbs/in.
coil bind : 1.195.

Richie.

 

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1993 ED F/mont 5.0L, Auto, Edelbrock RPM's, CompCam XE276HR, Crane Gold Race 1.7's, Edelbrock Performer, 75mm T/B, MAP, 42lb , GenIII coils, PH4000's , Twin 2.5", Thermos & underspeeds, 3.7 LSD, 2800 stall and MoTec M800, 372fwhp @ 5400rpm & 387 ft-lb @ 4400 rpm.

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