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Engine Specific Info and Questions => IDI Engine => Topic started by: UnderPSI on July 16, 2010, 10:56:45 am

Title: Big Valve 1.6 Head
Post by: UnderPSI on July 16, 2010, 10:56:45 am: Putting 39mm intake and 34mm exhaust valves in a 1.6 head. Just got the seats and vavle guides in. Need to do some work on the exhaust and a ton of work on the intake to get the ports to blend with the seats.

Intake
(http://i976.photobucket.com/albums/ae246/swb909/VW/4.jpg)

Exhaust
(http://i976.photobucket.com/albums/ae246/swb909/VW/3.jpg)

(http://i976.photobucket.com/albums/ae246/swb909/VW/2.jpg)
Title: Re: Big Valve 1.6 Head
Post by: Rabbit on Roids on July 16, 2010, 11:40:44 am: anyone know what comes in an AAZ head? valve size wise?
Title: Re: Big Valve 1.6 Head
Post by: truckinwagen on July 16, 2010, 08:33:15 pm: very cool, I was going to try this myself.

quick question though, how close does this put the valves to the side of the bore?
also, do you think there is enough meat in the head to port it to that extreme without getting too close to the water jacket?

is it a hydro, or a mech head, and where did you get your valves/seats?

-Owen
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 17, 2010, 08:31:23 am: It's a mech head.
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 17, 2010, 02:25:11 pm: Started bowl work. Seems to be plenty there to cut.

(http://i976.photobucket.com/albums/ae246/swb909/VW/41.jpg)
(http://i976.photobucket.com/albums/ae246/swb909/VW/31.jpg)
(http://i976.photobucket.com/albums/ae246/swb909/VW/21.jpg)
Title: Re: Big Valve 1.6 Head
Post by: truckinwagen on July 17, 2010, 03:59:59 pm: very cool, would you mind taking a pic with a headgasket on it to show how close the valves get to the sides of the bore?

-Owen
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 17, 2010, 06:05:40 pm: Don't have the headgasket with me. Putting a 1.9 metal gasket on it. Should have room, block is done .5mm over that will give a little exta.
Title: Re: Big Valve 1.6 Head
Post by: arnold on July 18, 2010, 08:14:35 am: Where did you get those valve's and seats ?
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 18, 2010, 10:17:51 am: Machinest got the seats for me, the valves are of the shelf parts but I'm not sure if they will work quite yet.
Title: Re: Big Valve 1.6 Head
Post by: truckinwagen on July 18, 2010, 02:11:14 pm: when I was thinking of doing the same, I was thinking of using valves built for the aircooled VW.

they are cheap, available in a wide range of sizes(and in stainless) and have the right stem diameter to use the stock guides. the stems are too long, but any good machinist can cut them down to the proper length no problem.

you can get the stainless aircooled valves in just about whatever size you want for $10 per valve, and most of the retailers of the aircooled valves sell seats to match them too(but your machinist can probably get them for you cheaper)

are you willing to tell us how much you paid for the parts and machining?
I may just do this while I have my motor apart...

-Owen
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 18, 2010, 02:16:05 pm: Seats and guides were around $350. Trying to make it work with off the shelf parts to keep cost down use readily available parts. Also going to be using a hydro cam, hopefully everything will work without custom parts.
Title: Re: Big Valve 1.6 Head
Post by: RabbitJockey on July 18, 2010, 05:07:31 pm: are 1.9 and 1.6 valves the same size?
Title: Re: Big Valve 1.6 Head
Post by: MJF on July 18, 2010, 05:18:24 pm: 1,6 34in 31ex
1,9 36in 31ex
mech valves ~105mm long, hydr ~95mm.
Title: Re: Big Valve 1.6 Head
Post by: Aki-76 on July 18, 2010, 09:09:15 pm: http://s434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/?action=view&current=03042010812.jpg (http://s434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/?action=view&current=03042010812.jpg)

41mm in / 35mm ex

ceramic coated,off course ;)
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 18, 2010, 09:20:30 pm: Quote from: Aki-76 on July 18, 2010, 09:09:15 pm

41mm in / 35mm ex

Maybe just a hair big for a 77mm bore.
Title: Re: Big Valve 1.6 Head
Post by: truckinwagen on July 18, 2010, 09:22:19 pm: good lord!

anyone know at what point the valves start getting shrouded by the cylinder wall?
and also, do the runners on the 1.6 head have enough flow to support such big valves? I have always thought that the sharp turn at the valve bowl was the big flow restriction, not the factory valve size.

not to say that bigger valves would not help, but I wonder what the point of diminishing returns is...

-Owen
Title: Re: Big Valve 1.6 Head
Post by: Smokey Eddy on July 18, 2010, 10:35:40 pm: Same with the AAZ's Owen. when i ported my head i noticed it choked up incredibly at the 90 degree turn. Very worth noting.
Title: Re: Big Valve 1.6 Head
Post by: Aki-76 on July 19, 2010, 12:59:11 am: Quote from: Aki-76 on July 18, 2010, 09:09:15 pm
http://s434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/?action=view&current=03042010812.jpg (http://s434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/?action=view&current=03042010812.jpg)

41mm in / 35mm ex

ceramic coated,off course ;)

My new engine is 80.5mm bore,next engine is 81.5 or more.(mayby more = )

Thats true,big valve isnt all ways better than orginal.Orginal bore (aaz/1Y) best size is somethink 38-39mm in and 33 ex.

This head i run dyno 0.6 bar boost 218hp in wheel.
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 19, 2010, 09:35:25 am: (http://i434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/03042010812.jpg)

What head did you use for that?
Title: Re: Big Valve 1.6 Head
Post by: MJF on July 19, 2010, 12:19:24 pm: It´s 1,9 head.
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 19, 2010, 02:15:13 pm: A 1.9 head must have wider valve spacing than a 1.6.
Title: Re: Big Valve 1.6 Head
Post by: UnderPSI on July 27, 2010, 03:36:53 pm: Almost done, don't think you can go any bigger in a 1.6 head.

(http://i976.photobucket.com/albums/ae246/swb909/VW/30.jpg)
(http://i976.photobucket.com/albums/ae246/swb909/VW/20.jpg)
Title: Re: Big Valve 1.6 Head
Post by: Smokey Eddy on July 27, 2010, 04:54:40 pm: MJF's godly cylinder head...
I wish i could see UnderPSI's photos but i can't at work! :(