Best Engine Parts all years!!!!!!

[gsxeclipsed]

I have done some research and found the 1g head flows better and from RRE they said to get a 1g TB and intake but i couldnt find anything about the exhaust manifolds. This is for a 6 bolt that im building.???? Which flows better?? 1g or 2g??

 

[1998GSX]

http://www.vfaq.com/index-main.html

look under exhaust

 

[gsxeclipsed]

Thanx boy i feel dumb

 

[redturbo66]

2g exhaust manifolds and o2 housings flow better.

 

[heavyD]

2g exhaust manifolds and o2 housings flow better.

EVO III exhaust maniflod and O2 housing flow even better.

 

[redturbo66]

What's a maniflod?

 

[chicagoboostin]

What's a maniflod?

kind of like a tsunami

 

[redturbo66]

kind of like a tsunami

You get an "A+" for creativity!

 

[4geze63]

and the slowboy cast manifold flows even better then the evo

 

[gsxeclipsed]

well i think im ganna go with the 2g cuz im kinda on a budget

 

[awdsm drft]

well i think im ganna go with the 2g cuz im kinda on a budget

...don't you own a 2g?

 

[gsxeclipsed]

...don't you own a 2g?

Yes thats y im using it cuz its my favorite price

FREE

 

[DSMJim]

I have done some research and found the 1g head flows better and from RRE they said to get a 1g TB and intake but i couldnt find anything about the exhaust manifolds. This is for a 6 bolt that im building.???? Which flows better?? 1g or 2g??

1g head only flows more because the 1g cars came with more agressive cams and a larger throttle body. Better cams and larger throttle body on a 2g head with proper porting will outflow a 1G head with porting due to better port angle on the valve. The grosly oversized port on a 1G head only slows velocity and creates a huge angled entry around the valve. The basics of head porting state this is a poor design, much the reason why it was updated and changed on the 2G head.

 

[98spyderboost]

1g head only flows more because the 1g cars came with more agressive cams and a larger throttle body. Better cams and larger throttle body on a 2g head with proper porting will outflow a 1G head with porting due to better port angle on the valve. The grosly oversized port on a 1G head only slows velocity and creates a huge angled entry around the valve. The basics of head porting state this is a poor design, much the reason why it was updated and changed on the 2G head.

Well I have been thinking about doing a 1g head swap on my car as well. I havent done whole lot of research but most ppl never mention about the port angle. Your saying I'll be better off if I just port my 2g head and use a 1g mani?

 

[DSMJim]

Well I have been thinking about doing a 1g head swap on my car as well. I havent done whole lot of research but most ppl never mention about the port angle. Your saying I'll be better off if I just port my 2g head and use a 1g mani?

No I'm saying you will be better off porting your 2G head and using a sheet metal intake manifold like a magnus unit with a 60mm or better throttle body. You can have your stock throttle body bored out to 64mm as well.

To use a 1G intake manifold, which is a better design than a 2G manifold for sure, you have to hog your head out because the size of the ports on a 1G head match the 1G manifold. That completly negates using a 2g head because you just ruined the port angle by lowering the port down half an inch to match a 1g intake manifold. The whole point of using a 2g head is the angle of the air's entry into the valve is so much better so you can't port the intake down for 1g manifold. A 2g smim matches the port of a 2G manifold so a nice angled port job to straighten the path of the air down on the valve will work better. Simply having a big entry to the valve does not flow more air than a properly designed port (1g vs 2g)

When they did that manifold test I wish they could have done a simple HP test on a 2G head with smim vs 1g head with smim. I'll bet the results would have surprised a lot of people. That however is a lot of work with changing a head gasket etc so nobody in their right mind would do that.

 

[BREW]

Jim, i'm faced with the same decision that your explaining. The head is off and im trying to determine the best path to take as far as intake manifold / head combination with my 6 bolt . If I port the head but remain with the stock 2g manifold (planning to go to the sheet metal down the road), is there possible flow problems with the smaller intake runners on the stock mani to the enlarged head ports as far as the angled flow you were talking about. And lastly when I do switch to the sheet metal will it need to be ported to match the head as well? Or are the runners on the smim made to match a ported head to keep the angled flow?

Sorry if thats confusing,

BREW

p.s. Sorry to hijack, but I think this will help answer the question the topic implies.

 

[98spyderboost]

No I'm saying you will be better off porting your 2G head and using a sheet metal intake manifold like a magnus unit with a 60mm or better throttle body. You can have your stock throttle body bored out to 64mm as well.

To use a 1G intake manifold, which is a better design than a 2G manifold for sure, you have to hog your head out because the size of the ports on a 1G head match the 1G manifold. That completly negates using a 2g head because you just ruined the port angle by lowering the port down half an inch to match a 1g intake manifold. The whole point of using a 2g head is the angle of the air's entry into the valve is so much better so you can't port the intake down for 1g manifold. A 2g smim matches the port of a 2G manifold so a nice angled port job to straighten the path of the air down on the valve will work better. Simply having a big entry to the valve does not flow more air than a properly designed port (1g vs 2g)

When they did that manifold test I wish they could have done a simple HP test on a 2G head with smim vs 1g head with smim. I'll bet the results would have surprised a lot of people. That however is a lot of work with changing a head gasket etc so nobody in their right mind would do that.

Understood

 

[DSMJim]

If I port the head but remain with the stock 2g manifold (planning to go to the sheet metal down the road), is there possible flow problems with the smaller intake runners on the stock mani to the enlarged head ports as far as the angled flow you were talking about.

And lastly when I do switch to the sheet metal will it need to be ported to match the head as well? Or are the runners on the smim made to match a ported head to keep the angled flow?

Your confusing head porting with hogging out the holes like some idiots do to 2g heads and sell them on ebay. What they will do is raise the port a bit but were taling MM. If your having that done then have them port match your intake manifold as well, no big deal. Then when you do a SMIM just make the same adjustment to the new manifold. You will likely only have to raise the top of the port on the smim a small amount down the road. It's not that serious of an issue, it's not like they are taking out as much material as you would to make a 2g head look like a 1g head.

 

[NDgsx]

The 2G intake manifold gasket is matched pretty closely to the port, there is a minimal amount of material you can remove before passing it.

 

[BREW]

I understand, thank you for clearing that up. I was hoping not to have to switch completely to a 1g block and head, although i thought about for some time now. I was hoping someone could explain to me that the 2g head is capable, although not as much as the 1g, of flowing some pretty decent numbers.

I know this might be asking too much but as far as rumors saying that a 2g head on a 1g needs a 1g water pipe. I was looking at the differences as far as the water pipes go between the two and it looks as if the only differences are the 2g missing a tube going to the turbo and one to the oil cooler. If I plan on using and air to oil, oil cooler.....and an oil cooled turbo.....I dont see why the 2g water pipe and t-stat housing cant be reused, right?
I mean even if I did need water lines for the turbo and oil cooler, would splitting the one line that does come off the 2g water pipe (the one that goes into the block) be enough to cool both those components?

Once again sorry to push my luck but thanks in advance.

Brew