Opel 2.4 cih original camshaft profile

[Manta1900PT]

Hi.

Does anyone know whats the camshaft profile of a original 2.4cih engine?

Thanks in advance,

Pedro.

[wrench459]

Opel CIH Engine Cam Specifications

[Manta1900PT]

Thanks.

How do this cam works on a 2.0 head? Can i take any power from the cam on a 2.0 head?

[wrench459]

I would become friends with a cam grinder and I mean close friends.
And have a custom cam ground just for your combo.

Most oem's and also the aftermarket "fudge" there numbers.

You'll need some very detailed info beyond the obvious..weight,trans,rearend gear....

Port volume..
Valve c/l to throttle plate distance..
cross section area..
exhaust primary size and length
and on and on

[Manta1900PT]

once again, thanks for your reply.

Im in the process of building a 2.0 head with a 1.9 block of my Manta A.

Im going to go with a big valve head 40/45 and a camshaft 282º from Dbilas and porting, polish and working the head so i can get a better flow, knowing that the intake is the one to take a better care, since the exhaust is preety much ok, right?

I allready had read a lot of info but unfortunatly i still have some questions...

With this 2.0 big valve head, can i use my stock 1.9 pistons?

Do i have enough clearence from valve to piston?

The head is stock, never been milled.

I have seen some topics here but i remember that i saw some info like tutorial on building a 2.0 street head and a 2.0 racing head, but unfortunatly i dont find that anywere...

What do you think about this recipe? Will it work good?

[wrench459]

Opel Engine Performance Modifications - The Classic Opel Forums

This is the first place to look.

[Manta1900PT]

Originally Posted by wrench459 Opel Engine Performance Modifications - The Classic Opel Forums This is the first place to look.

Yes,

i have read a lot from the topics on that section, but still have this doubts...

[wrench459]

Originally Posted by Manta1900PT once again, thanks for your reply. Im in the process of building a 2.0 head with a 1.9 block of my Manta A. Im going to go with a big valve head 40/45 and a camshaft 282º from Dbilas and porting, polish and working the head so i can get a better flow, knowing that the intake is the one to take a better care, since the exhaust is preety much ok, right? I allready had read a lot of info but unfortunatly i still have some questions... With this 2.0 big valve head, can i use my stock 1.9 pistons? Do i have enough clearence from valve to piston? The head is stock, never been milled. I have seen some topics here but i remember that i saw some info like tutorial on building a 2.0 street head and a 2.0 racing head, but unfortunatly i dont find that anywere... What do you think about this recipe? Will it work good?

I try and get an idea on paper and work out the details.
Once I get an idea and the parts together I might go though 3,4,5 or even
6 trial fits. Before going to final assembly.

Then because I'm not perfect things can go booooooom
check
double check
triple check

[RallyBob]

Originally Posted by Manta1900PT Im in the process of building a 2.0 head with a 1.9 block of my Manta A. Im going to go with a big valve head 40/45 and a camshaft 282º from Dbilas and porting, polish and working the head so i can get a better flow, knowing that the intake is the one to take a better care, since the exhaust is preety much ok, right?

Something to consider is that the 2.0 head has different airflow characteristics than a 1.9 head. You will need to re-work the inlet and exhaust ports in *equal* amounts when modifying a 2.0 head, since it is the most balanced 'as cast' CIH head.

The 1.9 head has very good exhaust ports, but poor inlet ports, so it must be modified accordingly.

Bob

[Manta1900PT]

Originally Posted by wrench459 I try and get an idea on paper and work out the details. Once I get an idea and the parts together I might go though 3,4,5 or even 6 trial fits. Before going to final assembly. Then because I'm not perfect things can go booooooom check double check triple check

yes, that´s a fact.

[Manta1900PT]

Originally Posted by RallyBob Something to consider is that the 2.0 head has different airflow characteristics than a 1.9 head. You will need to re-work the inlet and exhaust ports in *equal* amounts when modifying a 2.0 head, since it is the most balanced 'as cast' CIH head. The 1.9 head has very good exhaust ports, but poor inlet ports, so it must be modified accordingly. Bob

Thanks for your reply Bob.

I´, trying to find your tutorial about how to make a 2.0 street head and also making a 2.0 race head... but still no luck...

Bob, am i gonna have problems with the 40/45 valves with the stock pistons of the 1.9 block?

[RallyBob]

Originally Posted by Manta1900PT Thanks for your reply Bob. I´, trying to find your tutorial about how to make a 2.0 street head and also making a 2.0 race head... but still no luck...

I have never done this for the 2.0 heads, only for the 1.9 heads. Similar, but certainly not the same!

Bob, am i gonna have problems with the 40/45 valves with the stock pistons of the 1.9 block?

With a standard camshaft, no problem. I have no idea if there will be interference with the Dbilas camshaft however, sorry!

[Manta1900PT]

Originally Posted by RallyBob I have never done this for the 2.0 heads, only for the 1.9 heads. Similar, but certainly not the same! With a standard camshaft, no problem. I have no idea if there will be interference with the Dbilas camshaft however, sorry!

ok.

Maybe it was Hiro...

what do you thnk about this cam from dbilas:

Duration
282

Peak
timing
107


Valve
lift
11,9

Lift
at TDC
2,3

Valve timing
IO/IC - EO/EC
34/68 - 68/34

[RallyBob]

Originally Posted by Manta1900PT Maybe it was Hiro...

Perhaps, I know on the RROC site he has some photos and guides for preparing the 2.0 heads.

what do you think about this cam from dbilas: Lift at TDC 2,3

I think that with 45 mm inlet valves, it will be very close. I say this because the valve-reliefs in the piston tops are not correctly located, the inlet valves will strike off-center to the reliefs if there is interference. Exhaust should have no problem however.

[Manta1900PT]

Originally Posted by RallyBob Perhaps, I know on the RROC site he has some photos and guides for preparing the 2.0 heads.

I will talk with Hiro. I´m going to buy some stuff from him and i´m going to ask about those pics. I remember that it was a great tutorial about building the 2.0 head street and race one´s.

Originally Posted by RallyBob I think that with 45 mm inlet valves, it will be very close. I say this because the valve-reliefs in the piston tops are not correctly located, the inlet valves will strike off-center to the reliefs if there is interference. Exhaust should have no problem however.

This is my problem. At this moment i don´t want to mess around in the block, and pistons, but i guess i have to...

[Manta1900PT]

what can i expect in HP with this changes?

I allready have 2 webers dcoe, supersprint header(independent for each cilinder)and 50mm exhaust tube.

I still have the original muffler but I allready have read that changing the back muffler is also a good help, can you confirm?

[Manta1900PT]

Originally Posted by RallyBob I think that with 45 mm inlet valves, it will be very close. I say this because the valve-reliefs in the piston tops are not correctly located, the inlet valves will strike off-center to the reliefs if there is interference. Exhaust should have no problem however.

Bob,

and if i go for a camshaft with 1,7 Lift at TDC?

How much valve clearance i have to have on intake and exhaust s i dont have problems?

Thanks in advance,

Pedro.

[Manta1900PT]

The safe valve clearance is .080 on the intake and .100 on the exhaust?

Can anyone confirm please?

[Viny Charb]

That's right!!!!