Page 1 of 2

Camshaft lobe dimensions

Posted: Tue Jun 12, 2018 11:30 am
by James 5th gen
So I picked up a set of “a7” cams a few weeks back and before I go through the trouble of installing them, I would like to know if they are indeed a7 cams. The last thing I want to do is put the same cams in.

Is there anyway to check other than measuring? And if not does anyone know the measurements? Thanks guys :D

Ps. If they are the correct cams I have a whole lot more questions on the way, or If I could have a chat with someone who has done it before that’ll be great :D

Posted: Tue Jun 12, 2018 12:09 pm
by Froidas
My A8 head is disassembled, I can measure in the evening.

Posted: Tue Jun 12, 2018 1:40 pm
by vanzep
Ive checked A1 cam dimensions against A8 cams before but cant remember dimensions - there wasnt a lot of difference in size but they do make quite a difference when fitted.
Im sure there is a part number stamped in between the lobes and this will be the easiest way to check.
nafeman or 4thgenphil will know what the part numbers are ;)
my spare A1 cams are stamped A on the exhaust cam and B on the intake cam

Posted: Tue Jun 12, 2018 5:56 pm
by hondaddict
Here the mesurement of the A7 camshaft, that are exactly the same than the 5thgen Prelude Type S, the good values are the "m/t with atts"

As you can see ( and said before by vanzep) the difference between the "normal" camshaft and the "TypeS/ TypeR" camshaft are not very big.


Posted: Tue Jun 12, 2018 8:52 pm
by Drax
god stuff 8-) we should add this to the Wiki

Posted: Tue Jun 12, 2018 9:14 pm
by James 5th gen
Thanks a lot guys, always a lot of help :D apparently I’ve lost my vernier so I’ll let you know once I’ve found it

Posted: Sun Jun 17, 2018 11:21 am
by James 5th gen
just had a measure up and it looks like i have the good ones :) not bad for only £41.

i will be looking at doing these in the next 2 months, can someone point me in the right direction for a good head rebuild guide? I've seen the cam swap post but half the pictures are missing. i also got a load of springs with the cams, should i buy new ones or are they okay? i also assume they are a different spring rate to the ones in my a5?

sorry for all the questions, i just dont know a lot about engine work and dont want to get anything wrong. thanks :D :D :D

Posted: Mon Jun 18, 2018 12:24 pm
by wurlycorner
The oem service manual tells you everything you need to know :D

Re: Camshaft lobe dimensions

Posted: Sun Nov 11, 2018 9:57 pm
by James 5th gen
Sorry to be a pain guys and ask again, I cannot find any information on the spring rates so if some one knows the answer that'll be nice :)

I want to put a7 cams into my a5, can i straight swap them without changing the valve springs? and if i can't do this is there a difference between springs on the inlet and exhaust side? i wouldn't like to get them mixed up if that's the case.

Re: Camshaft lobe dimensions

Posted: Sun Nov 11, 2018 10:56 pm
by Vtecmec
You can swap just the cams and you'll be fine, and no difference on intake v's exhaust springs.