Brazil & QSC Pistons

pocketrocket · Post by **pocketrocket** » Thu Nov 15, 2007 2:49 pm

With both the BR.94mm(cofab) & QSC 96mm pistons having the wrong pin height, down 1 mm from stock VW WBX pistons, I talked with Go Westy about the 1mm longer rods they said they do not have them any longer, so I went ahead and made up a fixture and did 5 sets with offset boring the small end & rebushing them with special bushing & offset boring it. resizing both ends. Each set will be the same from center line big to small . I can also install the arp bolts if anyone wants those. I replace all 2.1 bolts with 1.9 or 1600cc bug bolts. Any one wanting a set you can email me about getting a set outright or exchange. Has anyone used the QSC 96mm and had any trouble getting the packing grease off them? I had to take all the rings off and clean each one in solvent & soak the pistons to get all of the grease off it was like honey. Thanks Rocky

51MAN · Post by **51MAN** » Fri Nov 16, 2007 2:11 am

Have a look at Tencentlife's posts on the QSC's..... there is a load of info in there... http://www.shoptalkforums.com/viewtopic.php?t=109925

I have just scored a set of 98mm oettinger barrels and pistons.. and am seeing if I can get them re made.. if anyone is interested...???

wellington · Post by **wellington** » Fri Nov 16, 2007 6:38 am

98mm quality barrels and pistons would be welcomed!!! When you have pricing and availability let me know please.
Rocky, Tencents found the rings to be poor, he replaced all rings.

pocketrocket · Post by **pocketrocket** » Fri Nov 16, 2007 10:19 am

Just started to install the piston pins. On the set I have the pins are about 2 mm to long can't get the clips in. Got a used stock VW pin from a 2.1 94mm it gos right in clips go in just like they should. Just something else to look out for. Rocky

pocketrocket · Post by **pocketrocket** » Fri Nov 16, 2007 2:25 pm

Well after trying to get the piston pin from the 2.1 stock into the piston it was a bit tight . Out comes the mic & the diff. stock 2.1 about 2 tenths bigger than the QSC piston pin. So over to the lathe with carbide to trim .040 off each end to get the QSC pin to work debured and stoned the end to get the burrs off inside & out. What a PITA. and the story gos on. Rocky

Badbugtwo · Post by **Badbugtwo** » Fri Nov 16, 2007 2:49 pm

pocketrocket wrote:...so I went ahead and made up a fixture and did 5 sets with offset boring the small end & rebushing them with special bushing & offset boring it...

Here are some pics of the rods Rocky is refering to...

tencentlife · Post by **tencentlife** » Sat Nov 17, 2007 11:41 am

This is a cool thing to do, Rocky. I see you found out about the too-long wrist pins as well. I was able to use some regular wbx pins and they fit fine. The rings they supply are no good, either, they are too narrow in the grooves by far.

I've written David Shum at QSC about the pins and they checked it out. Hopefully they will be supplying the right length in future if they stick with this product. I haven't told him about the ringsets, yet. I had to get two Volvo B23 sets mixed from Deves to make that work, but if QSC just changed the width on either the middle or bottom ring groove they could use one of the two standard B23 sets. It would be a good product if they got these details straightened out. The pistons themselves seem to be of good quality, and the barrels are pretty beefy, with original thickness walls instead of the thinner walls of a bored-out stock liner.

I have sets of both the QSC and Cofaps, though, and the comp heights as I recall differ by about 0.25mm, so a standard-offset wrist pin bushing may not work as well on one as the other. I could be wrong, but you should check to see if there are meaningful differences. Of course, if one type came out 0.010" too high, that would be a good thing as the quench height would be tighter but still in a safe range.

pocketrocket · Post by **pocketrocket** » Tue Nov 20, 2007 3:16 pm

After my mock up & leak down. I decided to go with deves rings same as tencentlife. Got my set of Deves Rings the top end gap was .015. 2nd was .010 opened it to .013, oil rings looked good. If anyone wants a set of the right rings, I will stock them from now on. Also anyone wanting to have their pins shortened to the right lenght and wanting rods done with the .040 offset I will be doing the rods on an exchange basis. I will install the arp bolts p/n 104-6001 if you want them. Also want the thank tencentlife for his sharing of his build. Rocky

tencentlife · Post by **tencentlife** » Tue Nov 20, 2007 4:32 pm

Hey, my pleasure. It'll be nice to know there's someplace I can do one-stop shopping for those rings and pins, because I'll definitely be using these pistons again, even if QSC doesn't do the QC on those components.

So, Rocky, are you going to stock the pistons as well? If so, how much will you let them go for, with the right rings and pins?

Now I've got to get to work on the killer exhaust I need for this thing. I'm gettin' an education on that! Keep an eye out, 'cause there should be a nice tuned 4into1 system for the wbx available in the not-too-distant future.

pocketrocket · Post by **pocketrocket** » Tue Nov 20, 2007 4:56 pm

Yes, I will stock the p&cs & the Deves rings & offset rods. I would like to hear about your 4 in to 1 headers. I would like a set for the WBX into my bug i'm working on. Rocky

tencentlife · Post by **tencentlife** » Tue Nov 20, 2007 6:54 pm

I'll keep everyone up to date. There's a lot of interest in a tuned exhaust for a NA wbx in a Vanagon. Gotta clear that crossbeam. I need one to get the top end power out of this 2.2 with the 2254. It's a torque monster at low rpms, up to about 3200, but lays down above. Too much overlap, without sufficient extraction. I think the intake charge is probably getting backwash. My other 2.2 with the 2252 cam at 214deg. has better cruising power up that high, but nothing like this bottom end.

I want to do an equal-runner 4into1 that doesn't reduce ground clearance, with the lengths optimised to put the torque peak at around 3800k, and the right size to let the hp build even higher up. I want to position the collector outlet in a place where adding on a turbo would also be convenient. Any thoughts on that?

Post by **Piledriver** » Tue Nov 20, 2007 9:05 pm

tencentlife wrote: I want to position the collector outlet in a place where adding on a turbo would also be convenient. Any thoughts on that?

Hell Yeah?

One of the T3 systems should be close...

51MAN · Post by **51MAN** » Wed Nov 21, 2007 7:21 am

I am working on just that... (well without proviso for turbo.. tho it may have the space in the end!!!)

Its going on my 2.5L wbx and in a syncro so ground clearance are important... 2 bores as it prob needs to be a little bigger for the 2.5 than 2.1's..

Reckon that cam would work for me too... gonna buy a couple of different cams to see what I get and what works for each intake setup..

Badbugtwo · Post by **Badbugtwo** » Wed Nov 21, 2007 8:31 am

pocketrocket wrote:Yes, I will stock the p&cs & the Deves rings..

Here's a pic...

tencentlife · Post by **tencentlife** » Wed Nov 21, 2007 9:52 am

I like using Deves, have always had good results with their rings, and it's nice to buy from a domestic company that's been around a long time. But, be careful to check those ring gaps. I ordered two sets made up that were combinations of rings from the two different Volvo B23 motors to get sets that would work on those QSC slugs. One set of the top rings have absolutely huge gaps, bigger than the VW specified wear limit even. The other set of the same part were all in spec. So be careful to check. I still have to call them to exchange this bad set.

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Brazil & QSC Pistons

Brazil & QSC Pistons

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