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Old 07-30-2004, 02:15 AM   #1
singsing
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Default version 8 STi cams vs V7 STi RA spec C cams

hi all

i have a set of v7 sti ra spec C heads with cams. unfortunately the rhs inlet cam is frucked.

i have searched and got a fair idea of how cams are relative to each other.

i need to replace my cams. i cant be 100% confident of just getting 1 cam to replace the broken one as i dont have 100% positive identification of what i have as i bought it 'used'. i dont want to get a cam that is 'incompatible'.

i have the option of swapping all the cams out for version 8 STi avcs cams (not RA/spec c). i am assuming these cams drop into the v7 RA heads.

what are the the v8 cams compared to the v7 spec C cams?? duration/lift etc... i have 'heard' that v8 STI cams are as 'good' as the v7 spec Cs? can anyone confirm/refute this.

i cant find any specific info on this

please enlighten as my engine build is significantly delayed now...
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Old 07-30-2004, 07:08 AM   #2
KKoepp31
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I've heard the same, that the Ver8 cams are better than the ver7's and that's why I just bought ver8 heads. I'd really like to swap out for some JUN's though, so if need a source for the 8's I'm sure we could work out a deal. Just let me know.
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Old 07-30-2004, 07:47 AM   #3
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Ver 8s are as good as the ver7 spec C cams and they will fit fine. The ver 8 spec C may have a different cam then the ver 8 tho...

http://forums.nasioc.com/forums/showthread.php?t=595513

http://forums.nasioc.com/forums/show...o&pagenumber=2
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Old 07-30-2004, 10:54 AM   #4
singsing
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ok

has anyone measured them to objectively prove the v8 cams being better or as good as ver 7 RA spec Cs?

if this is the case, this might be a good option to replaced my broken cam (swap whole set?)
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Old 07-30-2004, 11:21 AM   #5
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Quote:
Originally Posted by singsing
ok

has anyone measured them to objectively prove the v8 cams being better or as good as ver 7 RA spec Cs?

if this is the case, this might be a good option to replaced my broken cam (swap whole set?)
996Cabby said the ver 8 spec c are different then the ver 7 spec c. As he is the jdm guru and has the sti parts book I will take his word on that. The ver 7 spec c has a cam a lot like the base ver 8. That info comes from Ron at axis and a few others who have had the cams. The info is in the links. The are measurements for the ver 7 and ver7 spec c in that second link. there are others too I belive.
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Old 07-30-2004, 12:37 PM   #6
Thomas Ruble
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Quote:
Originally Posted by singsing
ok

has anyone measured them to objectively prove the v8 cams being better or as good as ver 7 RA spec Cs?

if this is the case, this might be a good option to replaced my broken cam (swap whole set?)
Why replace the set ? Didn't you just have one cam damamged ? Just get a replacement ver. 7 RA intake cam. I damaged one of my RA exhaust cams while removing my heads for some modifications. I ordered a replacement cam from Rallispec for $350... ouch. I would not spend the money on replacing them with Ver. 8's. You may also want to replace your buckets for the new cam too ( I would ).
Tom
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Old 07-30-2004, 12:44 PM   #7
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I think he's more worried about not knowing what cams are in the car right now and buying one that wouldn't match the rest. If he's going to buy a whole set, might as well upgrade if possible.
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Old 07-30-2004, 01:47 PM   #8
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Quote:
Originally Posted by KKoepp31
I think he's more worried about not knowing what cams are in the car right now and buying one that wouldn't match the rest. If he's going to buy a whole set, might as well upgrade if possible.
Yes I see now. I read where he stated having spec C heads but then I see he is not certain.
So what about the ID sticker on the back of the LHS head ? Is it still there ?
If not then maybe talk to the person who sold you the heads and see if there is a sticker on the short block. Another option is too measure the cams himself or take the cams to a machine shop and have them measured more accurately for lift and duration. He can then cross reference the findings although their have been variations in spec's posted here for the RA cams. Or maybe post a photo of the intake ports to get opinions on whether they are the larger spec C version.
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Old 07-31-2004, 07:13 AM   #9
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hi

i was told that what was sold to me was v7 RA spec C heads. my casting numbers are RHS20V 008 and LHS20V 006 (the 006 or 008 may be wrong way round! dont ahve them here to see). there are no white stickers etc. i dont ahve vin number of car it came out of. looking at the pictures of the ports posted on this board, it looks like i do have the large port RA heads. the company i bought it from is reputable. so therefore i can only go on what i am told BUT there are no identifying markers on the cams themselves.

so.. objectively i cannot tell what cams these are short of measuring them. and i was told that there were some different models depending on market??? (ron @ axis)

so from all this i have concluded that it is an unacceptable risk to just buy one cam. this will cause unspeakable delays (to an already delayed project) if this cam doesnt match the other 3!!!!!

anyway.. ron @ axis just emailed me telling me that he thinks the standard v8 STi cams are NOT as good as the v7 RA and RA spec C cams.... and he also said that the diff was not noticeable until after 7200rpm.

i want to rev to 8000 as i have a reasonable largish turbo (avo450) with realatively tall gearing.

oh well. i hope the v8 sti cams work out well.
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Old 07-31-2004, 11:16 AM   #10
Thomas Ruble
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Well Ron is the man...... I choose him to do my head work and I trust his opinion. It's too bad their isn't a simple and fast answer for your dilemma but I think you will be happy with the Ver. 8 cams just the same.

Have fun, Tom.
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Old 07-31-2004, 11:26 PM   #11
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yeah, i know

but will have to wait and i hate waiting as i have been waiting for a while now

if anyone has objective QUANTIFICATION of the differences in the 2 cam profiles, i would be most interested to know what they are.

but at the moment, i will be glad just to have a set of cams that arent broken
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Old 09-16-2011, 12:23 PM   #12
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.....

Last edited by nhat; 09-16-2011 at 12:36 PM.
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Old 09-16-2011, 12:35 PM   #13
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quality first post.

you joined in '05 too?
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