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 Post subject: cam
 Post Posted: May 1st, 2013, 1:52 am 
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Joined: November 6th, 2010, 9:56 am
Posts: 550
Location: tamworth
hi guys comp cams have sent me this cam info for my spec of engine cam number is 12-250-3
rpm is 2300-6500 duration @ .50 240-246 valve lift is .507-.510 with 1.5 roller rockers but i have only got 1.6 rollers do you think i could get away with the 1.6 rockers with this cam cheers
p.s
will i better buying a rpm in take has im running the holy condender at min and bin told its 10 bhp less than elderbrook :D

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 Post subject: Re: cam
 Post Posted: May 1st, 2013, 7:14 pm 
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Joined: January 9th, 2010, 7:17 pm
Posts: 193
1.6 rockers simply give you more lift at the valve,,, so as long as you have piston to valve clearance they are good


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 Post subject: Re: cam
 Post Posted: May 1st, 2013, 7:23 pm 
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Joined: January 9th, 2010, 7:17 pm
Posts: 193
240--246@ 50 is a big old cam in a 355..especially with only 9.1 compression,,,converter change would be required.... Like I said before its the entire combination that's important,,, bottom of the page cams ain't really the answer,, did you inform comp that the compression was very low ,, you would have very low cranking compression with that cam


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 Post subject: Re: cam
 Post Posted: May 1st, 2013, 9:02 pm 
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Joined: November 6th, 2010, 9:56 am
Posts: 550
Location: tamworth
yes i did mate told them everything and that was the cam they said would work best diddent think it would i was looking at the 280h cam b4 you said the elderbrook cAM :)

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 Post subject: Re: cam
 Post Posted: May 2nd, 2013, 5:58 pm 
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Joined: January 9th, 2010, 7:17 pm
Posts: 193
What pistons are in this motor


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 Post subject: Re: cam
 Post Posted: May 3rd, 2013, 1:16 am 
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Joined: November 6th, 2010, 9:56 am
Posts: 550
Location: tamworth
zephyrc wrote:
What pistons are in this motor

flat top 4 relef valve type think they hypo

defo not forged but wish i had fitted sum tho then i could of fitted nos :lol:

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 Post subject: Re: cam
 Post Posted: May 3rd, 2013, 7:31 am 
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Joined: January 9th, 2010, 7:17 pm
Posts: 193
What maker and part number are they


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 Post subject: Re: cam
 Post Posted: May 3rd, 2013, 6:17 pm 
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Joined: November 6th, 2010, 9:56 am
Posts: 550
Location: tamworth
zephyrc wrote:
What maker and part number are they

dont no it was a wile brought them in a rebild kit had a choice of pistons cam etc

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 Post subject: Re: cam
 Post Posted: May 3rd, 2013, 6:25 pm 
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Joined: January 9th, 2010, 7:17 pm
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Need to find out because the information isn't making a lot of sense at the moment,, flat tops and 64 cc heads should give you way over 9.2 compression,,,,I am building a 350 at the moment with flat tops and 76 cc heads that will have 9.1 compression.... See if you can find details of your supplier and try to get the info,, it's quite important


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 Post subject: Re: cam
 Post Posted: May 5th, 2013, 12:20 pm 
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Joined: November 6th, 2010, 9:56 am
Posts: 550
Location: tamworth
zephyrc wrote:
Need to find out because the information isn't making a lot of sense at the moment,, flat tops and 64 cc heads should give you way over 9.2 compression,,,,I am building a 350 at the moment with flat tops and 76 cc heads that will have 9.1 compression.... See if you can find details of your supplier and try to get the info,, it's quite important

ok mate will do that plus im borrowing a mates compression tester to recheck compression

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