OST-069: Transformation
11-24-2020, 08:31 PM
Post: #8
RE: OST-069: Transformation
(11-15-2020 11:07 PM)Vaptor Wrote:  I have seen people smooth the valve guides down so they are flush with the IN/EX channel, is there any reason for doing this, or is it overdoing it.?

good question....

I assume you mean something similar to this.....

[Image: AEU86 AE86 - RE: OST-069: Transformation]


the actual 4AGE/ZE valve guide is all of 1.6" long....it holds the 4AG valve stable at valve speeds up to 75 opening/closings per second......

[Image: AEU86 AE86 - RE: OST-069: Transformation]

The more you shorten it, the less stable the valve becomes. Shorten it a little, and it isn't likely to be an issue, shorten it more....???

But how short is too short?? I can't tell you..... for I don't know.


What I do know, is Loynings does use guides on many of their 4AG race engines, while removing the guide boss, they still keep the guides....

[Image: AEU86 AE86 - RE: OST-069: Transformation]




In the same breath... I have shortened guides in one of my head builds... but it wasn't a 4AG... and it wasn't shortening them as much as in the above photo.

I was building a 1GG head, and the guides were longer then the 4AG guides, with similar, or less lift then a 4AG..... so I shortened them

intake....
[Image: AEU86 AE86 - RE: OST-069: Transformation]

exhaust....
[Image: AEU86 AE86 - RE: OST-069: Transformation]





When I port heads I've tried to follow one underlying rule..... "do no harm" Wink

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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Messages In This Thread
OST-069: Transformation - oldeskewltoy - 11-05-2020, 06:32 PM
OST-069: Transformation - Mylesmck - 11-05-2020, 06:56 PM
RE: OST-069: Transformation - banpei - 11-07-2020, 10:34 PM
RE: OST-069: Transformation - oldeskewltoy - 11-12-2020, 11:04 PM
RE: OST-069: Transformation - banpei - 11-13-2020, 10:48 PM
RE: OST-069: Transformation - Ivan141 - 11-14-2020, 10:50 AM
RE: OST-069: Transformation - Vaptor - 11-15-2020, 11:07 PM
RE: OST-069: Transformation - oldeskewltoy - 11-24-2020 08:31 PM
RE: OST-069: Transformation - Vaptor - 11-25-2020, 09:49 PM
RE: OST-069: Transformation - oldeskewltoy - 11-27-2020, 05:26 PM
RE: OST-069: Transformation - oldeskewltoy - 12-10-2020, 02:20 AM
RE: OST-069: Transformation - oldeskewltoy - 01-02-2021, 12:25 AM
RE: OST-069: Transformation - Vaptor - 01-02-2021, 12:41 PM
RE: OST-069: Transformation - oldeskewltoy - 01-05-2021, 09:33 PM
RE: OST-069: Transformation - banpei - 01-06-2021, 09:55 AM
RE: OST-069: Transformation - oldeskewltoy - 01-06-2021, 05:03 PM
RE: OST-069: Transformation - banpei - 01-08-2021, 09:53 AM
RE: OST-069: Transformation - mad.matt - 01-14-2021, 04:41 PM
RE: OST-069: Transformation - banpei - 01-02-2021, 09:49 PM
RE: OST-069: Transformation - Vaptor - 01-05-2021, 09:49 PM

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