QSC cylinders? anybody ever use them??

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I saw a set on E-bay, just checking this out. Please reply if you have any info

[mb911]

I will be using them But have no feedback yet. Henry from super tec exclusivly sells them , he loves them.. thats says allot in its self

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I'll call Henry! Thanks

[Scott R]

I was on the fence about these about two weeks ago, spoke to Henry and went Mahle. My situation my be different but I'm rebuilding my engine for as close to factory as possible and after a discussion with Henry I sourced a set of Mahles. It seems if that if your into race engines and are ready to rebuild every year or so that these are the way to go. However for Sunday driver like me, Mahles are a better choice.

[mb911]

I would consider it different sunday drivers are much easier on there engines then a racer

[Scott R]

Originally posted by mb911
I would consider it different sunday drivers are much easier on there engines then a racer

Let me elaborate and say Sunday driver/garage queen. My conversation specifically touched on items that I can't tolerate like piston slap and oil consumption. When it came down to it the only way to insure that didn't occur was to go Mahle.

[88-diamondblue]

I used the QSC/JE set and so far am happy with them. I have run them at 6000+ rpm at the track several days and no issues. I am so used to the piston slap @ startup that I don't notice anymore. They are not Mahle but in my case the Mahle's were not in my budget so it was these or the original Alusil P&C's.

[mb911]

I don't know how much piston slap you are really going to get as compared to a set of used mahle?? Oil consumption I doubt as well But I will let you know

[Scott R]

Originally posted by mb911
I don't know how much piston slap you are really going to get as compared to a set of used mahle?? Oil consumption I doubt as well But I will let you know

I don't know if I can get anyone I know to post, but I'll try. That being said I have in the past week met with a few folks that have JE's, and various cylinder combos and to me it's noticeable. The cold piston slap noise, while not something to worry about just bothers me. The oil consumption that I have seen recorded was about 5 ~ 10% more than a Mahle rebuild that we compared, and out of four owners three had a tiny bit of smoke normally on startup, also something considered normal on our engines.

Now these were not issues that anyone into track application was very concerned about, and honestly it would not bother me either if I was into track application. However I want to get my motor back to factory, so I think I just have different goals than most folks do. I think it just depends on how you roll, when I was talking to Henry he did say he went to lengths to get as matched a set of cylinders as humanly possible, so it would be great to hear from one of his cylinder customers that actually have some hours on their engine.

[88-diamondblue]

I bought these from Supertec and have about 4000 miles with 2 track days, 1 autocross and some very hard runs in the Black Hills. I have had absolutely no smoke on startup or while runing except I believe that I have a pinched seal on one or more of the intake valves since I am using about 1 quart/600 miles. Finally saw a puff of smoke on a high rev decel when my son was running at the autocross. Did a leakdown which was 2-5% and a compression test which ranged from 195-203 this was done two different times and was repeated. The spark plugs looked great as well. Rev limit was raised to 7000 which I never get to since the power dies quickly after 6600 rpm. But it does see the 6500 rev frequently

[Scott R]

Originally posted by 88-diamondblue
I bought these from Supertec and have about 4000 miles with 2 track days, 1 autocross and some very hard runs in the Black Hills. I have had absolutely no smoke on startup or while runing except I believe that I have a pinched seal on one or more of the intake valves since I am using about 1 quart/600 miles. Finally saw a puff of smoke on a high rev decel when my son was running at the autocross. Did a leakdown which was 2-5% and a compression test which ranged from 195-203 this was done two different times and was repeated. The spark plugs looked great as well. Rev limit was raised to 7000 which I never get to since the power dies quickly after 6600 rpm. But it does see the 6500 rev frequently

Thanks for the information on that, I have a brand new set of Mahle 3.2's and I'm leaning towards having them machined for my 3.0 crank and rods per one of Henry's posts. However for what I could sell the 3.2's for I may have to reconsider and get what you have.

[safe]

What is the price for a set of QSC with JEs?
Are they steelsleeved with aluminum fins?

[mb911]

Originally posted by safe
What is the price for a set of QSC with JEs?
Are they steelsleeved with aluminum fins?

No they are all aluminum..

[cnavarro]

From what I have seen, these aren't necessarily sold exclusively by Henry - there are indeed other selling them on ebay and there have been some discussions about them on other forums as well - as far as the pistons they are supplied with, I have seen some offered with cast pistons and would probably figure that if it comes with a JE, it's up to the seller to have ordered and properly fitted the pistons to them, to sell them as a matched set. That said, even though they may be the same cylinders, there is still a difference who you buy them with and if they stand behind it.

[mb911]

yes I believe they can come with different setups some cast, and they can be sourced with JE's. The JE would be a better option if you ask me. I am positive henry only sells them with JE's

[rvanderpyl]

I bought a set from one of the ebay vendors just as they were starting to offer them, got a very good deal on the cylinders and they ordered matching JE Pistons for me as well. Haven't built the motor yet but everything measures up within Porsche factory spec's so I don't expect any problems. I have a set of Mahle 2.7 cylinders as well, and they look exactly the same.

[Henry Schmidt]

We are using QSC cylinders in most street engines and every race engine we built. I have special ordered cylinders that I can't get from any other source at a reasonable price.
It is important that you buy these parts from a source that has a quality control system in place.

We QC every set. We build JE pistons to suit based on how the cylinders spec out.
QSC is no different than Mahle in that there a manufacturing tolerances that must be matched in order for a set to be usable.
Just like Mahle you maust match height and diameter to have the best set possible. We usually use 3 sets to make one.
That is not to say that the others are unusable it just says that you must have many sets to get the best possible match.

The quality of these cylinders is very high once proper care to match them is acheived.

One guy on Ebay is the boyfriend of the importers daughter. I'm pretty sure he's got no idea what he's selling.
Quality control is why we can offer a warranty even better than Mahle.


The new 81 MM 906 Cylinder exclusively from SUPERTEC.

[drsimonwong]

Henry,

Externally is there much visual difference between the QSC and Mahle cylinders?

I'm considering my options at the moment as I've just had my engine torn down and it appears a history of bad oil has caused some marked groving of my 3.2 Nikasil cylinders.

I'm tossing up between replating if my pistons are within spec., boring out to 98mm and getting JE's if not or going your 3.4 QSC+JE combo.

I would prefer to keep at the external appearance factory original or at least reasonably close.

Simon

[mb911]

they look very very similar infact you really can't tel them apart

[Henry Schmidt]

On all but my 906 cylinders, the QSC cylinders are dimensionally identical to Mahles. We actually used Mahle cylinders to make the molds.

In fact even my 906 cylinders are dimensionally the same as 906 Mahle Chromals with one difference.
My 906 cylinders use a 2.2 head configuration sans gasket groove.