2.0 Hyundai head on 1G, retard exhaust cam 1 tooth?

[SnowBird]

I understand the Hyundai head when timed right is advanced 5 degrees?

I was instructed to retard the cam gear one tooth, thus giving it a 2.5 degree of retarding. I was told by a local guru I got the head off of to do this. Im not checking him, just wanted to know if any of you guys know about this. Thanks in advance.

 

[steve]

I understand the Hyundai head when timed right is advanced 5 degrees?

That sounds like nonsense.

Based on your understanding how is the head causing the advancement? Is it the cam grind, the location of the timing marks, height of the head?

 

[JayRolla]

From what I know the only difference in the heads is the cams. If you put your turbo cams in you have a turbo head. Like Steve says, how could the cast of the head cause timing advancement?

 

[SnowBird]

I have no idea, I just trusted he knew what he was talking about since he is the best guy in the tampa bay area. Let me send him a shout and Ill figure out why.

 

[94awdcoupe]

The difference between turbo and non turbo cams is the intake cam on non turbo is advanced 5 degrees. The lift and duration of the cams is otherwise the same. The non-turbo cams have too much valve overlap for turbo use. You can use them with stock timing but turbo will boost a few hundred RPM later. Ideal if you have timing gears you can just retard the intake timing by 5 degrees and you are set. If you use stock gears with no adjustment you can retard exhaust cam by one tooth. This will reduce the valve overlap. There are threads of people running stock turbo cams one tooth retarded on the exhaust. This gives less low end and lopey idle, but killer top end. Doing this to a set of non-turbo cams has the same effect except not as radical.

I dont recommend retarding intake cam by one whole tooth. Its better to move the exhaust gear.

non turbo cam opens intake valve at 26 BTC
turbo cam opens intake valve at 21 BTC
there is 5 crank degrees difference or 2.5 cam degrees.
moving cam one tooth moves timing 7.5 cam degrees. so running non-turbo cams one tooth retarded is like running turbo cams with the exhaust retarded 5 degrees.


kinda hard to explain. hope this makes sense. correct me if I am wrong.

 

[SnowBird]

^Thats the guy I got the head off of. Thanks for the info Jerry.

 

[GSXeclipsePSI]

Can anyone else shine some light on this subject? I need to know now also since I ran into a issue myself.

Here is a link to my post and whats wrong.
(NOT TRYING TO JACK U Post)

http://www.dsmtuners.com/forums/cylinder-head-short-block/328921-shop-trying-pull-fast-one-1g-head-vs-2g-head-3.html

 

[j-jamrod]

intake ports in hyunday are much smaller than 2G ports, carefull

 

[slopefunk]

Not true, I have mic'ed both, and the intake ports are the same. At least on a 96 2g head compared to a 97 sonata head.