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250 Cam Advice 

 

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 Post subject: 250 Cam Advice
Posted: Fri Oct 05, 2007 7:34 pm 
Getting Side Ways
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Age: 31

Posts: 771

Joined: 20th Nov 2005

Ride: AU XR8 220 Manual

Hi all,

i am looking into buying a cam for my XF N/A setup. i have been looking through old threads for about an hour or so but havnt found exaclty what im looking for. my car has a 250 EFI block with a reco C2 head shaved for 10:1comp with heavy duty springs and collets in it. the ignition system is standard with good leads and plugs, i have a straight gas system and 3.23 gears with an auto.

i am looking for something that gives good midrange and can be used in this combination. i am thinking the wade 877,242a wades or the crow 14776, 14892.

which do people recommend, what are your experiences and what results might i acheive?

will i have clearance issues considering the head is shaved down a fair bit? also are new retainers requried for these sort of cams? and finally what is involved in dialling up a cam for best results, how is this done and can i do it at home?

note my car is also an auto and used daily, basically i want a good increase in low down torque and midrange power. a bit of a lumpy idle is good but as long as its dosnt require to feet at the traffic lights and i dont want to destry my fuel economy. an all round performer basically. thoughts and experiences?
Cheers
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Posted: Sat Oct 06, 2007 9:48 pm 
Getting Side Ways
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Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

You will need to recalibrate the dizzy. What are the specs on those cams??? Are you going to run an upper cyl lube set up???
What sort of LPG setup are you using???
Sprint Gas make a good setup for straight LPG systems, bolts on like a carby.

 

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Posted: Mon Oct 08, 2007 10:33 am 
Getting Side Ways
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Age: 31

Posts: 771

Joined: 20th Nov 2005

Ride: AU XR8 220 Manual

my gas system is a impco 225 with L convertor, good for 180rwkw so no problems with fuel.

my has the EST system so it cant be recalibrated, i have got top quality plugs and leads though and i plan to put a big coild and spark amplifier in it.

cam specs are:

242a
Ex .284
In .281 71-29
31-70 210
209 Hyd
Hyd .491
.486 110
Good idle, low to midrange
increase

877
Ex .293
In .293 70-32
31-72 212
212 Hyd
Hyd .507
.507 110
Needs springs, good midrange
2000 - 5500

my head has been shaved for 10:1 comp, will i have enough clearance for the valve lift?
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Posted: Mon Oct 08, 2007 9:44 pm 
Getting Side Ways
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Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

Yeah, I reckon so ( valve clearance ), You'll have to get rid of the EST. Use a pre- EST electronic dizzy, with an MSD 6AL system with it, or similar. You need a good fat spark. The more compression you got, the fatter the spark needs to be.
What sort of mixer are you using??? Whats it look like???
Have you concidered running an engine oil cooler???
Its a good idea to use roller rockers when you get over 1/2" lift, it saves the guides, reduces friction.

 

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