TheSamba.com :: View topic - Type 4, 82 mm stroke, 5.5 3/8 rods, need clearance help pls

Mon Nov 17, 2008 7:56 am

Thanks for helping.

I'm building a type 4, 82 Demello crank, 5.5 3/8Sscat rods, Chevy (Buick) journalwebcam 183/86b and the rods are hitting the case.

Do I clearance the rods? Case? If so, how and how much?

The rods appear to clear the camshaft, but I need to clearance the crank/case to make two good revolutions to be sure.

If you could respond with pictures, I'm sure others could use the knowledge too. I have books; Hot Rod VW engines also the Rebuild book as well as Bently manuals and the Baja Bugs.

I just don't see how much I can safely remove from the rods and case and would like to know.

Thank you for your time and help.

I would not be opposed to paying someone to do this either. I'm in Camarillo.

Ready to do this now.

Thank you.

John 8zero5 ate44 4665 johnowhite@hotmail.com

Mon Nov 17, 2008 9:59 am

This will be a challenge. There is NO BOOK or printed reference material that will assist with this or any of the other challenges that await you as this engine is assembled.

(FWIW I sell these parts already modified, for bolt together assembly without these headaches)

Lots of this is dependent on the rod you are using as well as the cam and it's base circle. The Type 4 requires a reduced base circle cam for strokes over 74mm with most all rod and cranks. The Wbe 163/86B is a cam that comes ground on a 1.150 base circle "as cataloged" and thats going to be impossible to use with the 82 stroke crank and those rods. What journal is the crank? 2.0, Chevy? Type 1?

You must grab yourself a cam ground on a 1.045 B/C at MAXIMUM before even attempting to do this.

People choose to make this much harder on themselves than it has to be, just because they don't do the required homework up front. research for 6 months before buying the first part when building an engine at this level-

Mon Nov 17, 2008 11:42 am

The journals are Chevy Journals. I have built several type 1's, all with 78mm or smaller cranks.

I thought I'd need to clearance. Just would like a little help.

Jake, you do have a very good website, and appreciate your devotion to the type 4. I just ordered a few things from your web site last week. Almost ordered your rods too, and probably should have since they weren't much more than the Scat ones after sales tax. But, It looked like everything was coming together for me to work on my motors this weekend.

I have a Wide Open Baja Type 4 motor, 104x76 that I'm using as a guide for a lot of things, it's fuel injected, had a bad seat, but I'm rebuilding it all.

But back, to the problem at hand, Clearance the case only? The rods and the case? How much do I need to leave at the top of the case for case intergrity?

Thanks.

John johnowhite@hotmail.com ate66 eightate7 5556

Mon Nov 17, 2008 12:24 pm

The case will need minimal clearancing, if you take 1.5 grams off each corner of the big end of the rods (REBALENCE THEM!) to clear the case.

The cam is a different story, you have a serious collision there and without a reduced B/C cam you are not overcoming it.

The TI experience will do you no good in this world, all it will do is get you into trouble since the engines share little.

Our parts offer value you can't buy anywhere else- I could have made the crank, rods and cam all fall together without a single hitch...

Mon Nov 17, 2008 12:58 pm

Thank you Mr. Raby, I'm sure you could.

You've done a really good job in putting the pieces together. It's a shame these aren't more popular.

Mon Nov 17, 2008 1:00 pm

Quote: It's a shame these aren't more popular.

They are, just not on this Continent.

Mon Nov 17, 2008 2:01 pm

Here's my type 4 build....it shows the clearancing needed.
http://sjvwc.net/forums/index.php/topic,3769.0.html

Mon Nov 17, 2008 2:21 pm

I think it is better to switch to Pauter rods . They have more clearance to the lobes . With Scat there is no way for my opinion .

udo

Mon Nov 17, 2008 4:33 pm

Webcam is sending me their smaller circle cam

I'll just take my plasma cutter and burn off a rod corner (smerk) (just seeing if you were awake) but I'll kiss the rods on the belt sander and rebalance them and the Fordam should peal off a little case material so all will be right, so far.

Thanks for the picture of your build. I'll shoot some pictures to help the next guy.

Tue Nov 18, 2008 7:11 am

The rods were clearanced and polished where ground to try to get rid of any propigating issues and the case clearanced.

http://www.flickr.com/photos/working_again/3040265371/in/photostream/
http://www.flickr.com/photos/working_again/3041105920/in/photostream/
http://www.flickr.com/photos/working_again/3041106152/in/photostream/
[/img]http://farm4.static.flickr.com/3159/3041106290_6d4c3a04ab.jpg[img]

Wed Nov 19, 2008 11:12 am

i just built a 2316cc, 96x80 using 2.0l journals and EMW H-beams. (this thing sounds MEAN).

i'm running the same cam with a 1.1" base circle cam and 108* LC and no clearancing was needed to the rods or the case.

my first cam was a 163/86b on non reduced base circle cam on 104* LC and the rods JUST barely cleared the cam.

like jake said, everything depends on everything else. "its all in the combo"...

i think i just lucky. as for using a small journal...hopefully i won't regret it...but its a weekend driver so i should be good.

good luck with the build.

bj