Lude Generation

The UK Honda Prelude Club

Camshaft lobe dimensions

Forum Technical Engine / GearBox


Engine/Gearbox questions and discussion
Posts: 153
Joined: Thu Sep 29, 2016
My Generation: 5G
Reputation point: 0
Has liked: 0
Been liked: 12

 Postby James 5th gen »Tue Jun 12, 2018 11:30 am

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

User avatar
Posts: 251
Joined: Mon Jan 30, 2012
My Generation: 4G
Reputation point: 45
Has liked: 15
Been liked: 24

 Postby Froidas »Tue Jun 12, 2018 12:09 pm

My A8 head is disassembled, I can measure in the evening.
Yellow Dream made true.

User avatar
Supporter 2016
Posts: 5564
Joined: Sun Jan 29, 2012
Location: Edinburgh
My Generation: 4G
Reputation point: 932
Has liked: 533
Been liked: 644

 Postby vanzep »Tue Jun 12, 2018 1:40 pm

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
1996-2000 1993 EG9 Blue Civic 1.6 Vti - Traded in against the BB4
2000 on > 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD Manual
2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD&TCS Manual
(LOTM Oct 2016)

Posts: 273
Joined: Sun Mar 06, 2016
My Generation: 3G
Reputation point: 10
Has liked: 51
Been liked: 21

 Postby hondaddict »Tue Jun 12, 2018 5:56 pm

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.

Accord Type R , "what else" :lol:

User avatar
Supporter 2014
Posts: 4869
Joined: Wed Dec 22, 2010
Location: Wrexham, North Wales
My Generation: 4G
Reputation point: 290
Has liked: 16
Been liked: 573

 Postby Drax »Tue Jun 12, 2018 8:52 pm

god stuff 8-) we should add this to the Wiki

Posts: 153
Joined: Thu Sep 29, 2016
My Generation: 5G
Reputation point: 0
Has liked: 0
Been liked: 12

 Postby James 5th gen »Tue Jun 12, 2018 9:14 pm

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

Posts: 153
Joined: Thu Sep 29, 2016
My Generation: 5G
Reputation point: 0
Has liked: 0
Been liked: 12

 Postby James 5th gen »Sun Jun 17, 2018 11:21 am

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

User avatar
Ye are glad to be dead, RIGHT?
Posts: 19732
Joined: Sat May 19, 2012
Location: Chelmsford, Essex
My Generation: 4G
Reputation point: 888
Has liked: 5516
Been liked: 1653

 Postby wurlycorner »Mon Jun 18, 2018 12:24 pm

The oem service manual tells you everything you need to know :D

Forum Technical Engine / GearBox


The team

Who is online

Users browsing this forum: No registered users and 1 guest

Powered by phpBB © 2010 - 2016 - Web by H22 Solutions Limited