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Finally got the tools, the time and a victim to test my understanding of cylindricity.
I am not a rocket scientist, but I'm fortunate to know one (SpaceX and Tesla alum) to guide me through this. (Thanks, Jaime)
What this is not is an effort to measure the bores to the factory spec. That's another task.
And cylindricity does not mean the cylinder is not macaroni shaped. Not true. It can. It's the limitation of a 2D tool.
1989 Porsche S4 with ~150k miles
Came to me equipped with an Andy Keel supercharger.
Owner came out one day and when he started it he was met with a whump whump whump.
Intercooler fluid had leaked into a couple of cylinder and shot out when the spark plugs were removed. PO said it was 3 and 4.
I'm not sure I heard that right because 5, 6, 7 and 8 show discoloration.
The tools. The setting ring
The bore gauge and pregame calculations - and where the .0032 came from
5-8 cylinder walls
The results
Opening the floor for questions and comments
Last edited by Kevin in Atlanta; 07-04-2022 at 09:48 PM.
Some of those certainly look a bit oval. Any idea what the factory specs are? It would be fantastically instructive to get numbers from that NOS block that was just posted here recently.
Cool stuff, I look forward to learning some from people that actually know things (I'm talking relative to myself, BTW, since that may not have been clear).
I usually use the piston, inverted, and measure with a feeler gauge inserted between the center of the piston skirt, at 90 degrees to the piston pin. Rotate the piston 90deg, and repeat. I do have a bore gauge tool, but the piston is easier, for an existing situation.
I usually use the piston, inverted, and measure with a feeler gauge inserted between the center of the piston skirt, at 90 degrees to the piston pin. Rotate the piston 90deg, and repeat. I do have a bore gauge tool, but the piston is easier, for an existing situation.
This should be interesting....
Let's see how many people catch the "big" mistake....it took me 10 seconds!
Back off you creep. Life's a learning process. Nobody's born with these skills. Why don't you try to help and add something positive instead of just being a creep.
Back off you creep. Life's a learning process. Nobody's born with these skills. Why don't you try to help and add something positive instead of just being a creep.
Thanks for that!
I was going to happily guide Kevin through this process...just like I just got done helping him through his running issue, with his stroker.
.....Once he saw his grammar school math mistake.
I understand that attitude.
Loud and clear.
Have fun!
I really cannot understand how you cannot understand that what you describe as being helpful always starts with showing us how smart you are and how dumb we are.
Here's how your response should have started. I've translated for humans.
Kevin,
First thanks for showing your math. Most people simply post results I need to guess how they got them.
While you made a nice effort I need to point out there is a problem in your math.
I really cannot understand how you cannot understand that what you describe as being helpful always starts with showing us how smart you are and how dumb we are.
Here's how your response should have started. I've translated for humans.
Kevin,
First thanks for showing your math. Most people simply post results I need to guess how they got them.
While you made a nice effort I need to point out there is a problem in your math.
I'll send you a suggested correction in a PM.
Regards, Greg
I really appreciate you telling me how to live my life and word my responses.
For your information, I'm not a liberal and dislike most of the "woke" agenda.
So, I don't tend to sugar coat things....never have.
In the past 24 hours:
I've helped a Rennlister with questions about his new GTS, with oil consumption problems, with suggestions on doing things to help, until we can take a look at it, near the end of this year. He's thrilled that I helped him.
I've answered a series of 15 phone calls, from a Rennlister, who's car would not start, in the mountains. (And got it running, for him, BTW.) He's "over the moon", since he doesn't have to pay for a 200 mile tow.
I've typed a helpful post on "early" 928 clutches and then (privately) offered to stop and look at a Rennlister's clutch (in Fresno....4 hours away from me) and answer his questions. He's "over the moon" that I would do this.
I've told a Rennlister that he could borrow my block repair tool and inserts for fixing water pump damage. I'd guess he's happy.
I've helped a Rennlister on suggestions about how to trace his '83 that won't start. (Still working through on this, but he's not bitching at me, over how I worded how to trace things.)
I've answered and sent 4 people (obvious Rennlisters) to talk to a friend about a fantastic deal on a rare 928. They seem pleased.
I've sent off Emails to 3 people who I'm doing work for.....all Rennlisters. They love the Emails/pictures and the attention to details.
Amazingly enough, not a single one of those people are butt hurt
and asking me to be more "gentle" in my responses....
In terms of me "being helpful always starts with showing us how smart you are and how dumb we are",
I'd submit that possibly you might want to (at the very least) try that shoe on.....and see if it fits.
And get together with your rocket scientist friend and figure out how to divide .028 by 25.4, correctly.
Because if you "start" with that mistake, it looks like that messes up...everything you did!
Now, I'm not going to EVER bother you again....it is a promise.
And I'll make sure that my friends don't bother you, either.
No telling you that your cam timing is off on your stroker (before you removed the engine.)
No telling you that you can't run injectors that are way too big for the engine.
Not going to tell you what happens when dampers are too small and can't control pressure surges.
Not going to teach you grade school math.
Not going to teach you about piston to wall clearances.
I really appreciate you telling me how to live my life and word my responses.
For your information, I'm not a liberal and dislike most of the "woke" agenda.
So, I don't tend to sugar coat things....never have.
In the past 24 hours:
I've helped a Rennlister with questions about his new GTS, with oil consumption problems, with suggestions on doing things to help, until we can take a look at it, near the end of this year. He's thrilled that I helped him.
I've answered a series of 15 phone calls, from a Rennlister, who's car would not start, in the mountains. (And got it running, for him, BTW.) He's "over the moon", since he doesn't have to pay for a 200 mile tow.
I've typed a helpful post on "early" 928 clutches and then (privately) offered to stop and look at a Rennlister's clutch (in Fresno....4 hours away from me) and answer his questions. He's "over the moon" that I would do this.
I've told a Rennlister that he could borrow my block repair tool and inserts for fixing water pump damage. I'd guess he's happy.
I've helped a Rennlister on suggestions about how to trace his '83 that won't start. (Still working through on this, but he's not bitching at me, over how I worded how to trace things.)
I've answered and sent 4 people (obvious Rennlisters) to talk to a friend about a fantastic deal on a rare 928. They seem pleased.
I've sent off Emails to 3 people who I'm doing work for.....all Rennlisters. They love the Emails/pictures and the attention to details.
Amazingly enough, not a single one of those people are butt hurt
and asking me to be more "gentle" in my responses....
In terms of me "being helpful always starts with showing us how smart you are and how dumb we are",
I'd submit that possibly you might want to (at the very least) try that shoe on.....and see if it fits.
And get together with your rocket scientist friend and figure out how to divide .028 by 25.4, correctly.
Because if you "start" with that mistake, it looks like that messes up...everything you did!
Now, I'm not going to EVER bother you again....it is a promise.
And I'll make sure that my friends don't bother you, either.
No telling you that your cam timing is off on your stroker (before you removed the engine.)
No telling you that you can't run injectors that are way too big for the engine.
Not going to tell you what happens when dampers are too small and can't control pressure surges.
Not going to teach you grade school math.
Not going to teach you about piston to wall clearances.
You and I are even...and done.
Have a great life!
Regards, Greg
There is a difference between being polite/considerate and being a dick, and yeah I've crossed that line before myself, but the difference is I regretted it & you seem to think it's ok to be a dick as long as you warn everyone 1st. Your personality ranks right up there with Marc and Carl & see where it got them.
Last edited by Bigfoot928; 07-04-2022 at 07:50 PM.
Shake it off! This is definitely worthy of a thread topic. Never underestimate the sum of lurkers that gawk at stuff like this or the insatiable appetite of others to learn and appreciate this kind of content.
The 928 is alive and well today in large part due to this forum. Take the good. Leave the bad.
I really appreciate you telling me how to live my life and word my responses.
For your information, I'm not a liberal and dislike most of the "woke" agenda.
So, I don't tend to sugar coat things....never have.
In the past 24 hours:
I've helped a Rennlister with questions about his new GTS, with oil consumption problems, with suggestions on doing things to help, until we can take a look at it, near the end of this year. He's thrilled that I helped him.
I've answered a series of 15 phone calls, from a Rennlister, who's car would not start, in the mountains. (And got it running, for him, BTW.) He's "over the moon", since he doesn't have to pay for a 200 mile tow.
I've typed a helpful post on "early" 928 clutches and then (privately) offered to stop and look at a Rennlister's clutch (in Fresno....4 hours away from me) and answer his questions. He's "over the moon" that I would do this.
I've told a Rennlister that he could borrow my block repair tool and inserts for fixing water pump damage. I'd guess he's happy.
I've helped a Rennlister on suggestions about how to trace his '83 that won't start. (Still working through on this, but he's not bitching at me, over how I worded how to trace things.)
I've answered and sent 4 people (obvious Rennlisters) to talk to a friend about a fantastic deal on a rare 928. They seem pleased.
I've sent off Emails to 3 people who I'm doing work for.....all Rennlisters. They love the Emails/pictures and the attention to details.
Amazingly enough, not a single one of those people are butt hurt
and asking me to be more "gentle" in my responses....
In terms of me "being helpful always starts with showing us how smart you are and how dumb we are",
I'd submit that possibly you might want to (at the very least) try that shoe on.....and see if it fits.
And get together with your rocket scientist friend and figure out how to divide .028 by 25.4, correctly.
Because if you "start" with that mistake, it looks like that messes up...everything you did!
Now, I'm not going to EVER bother you again....it is a promise.
And I'll make sure that my friends don't bother you, either.
No telling you that your cam timing is off on your stroker (before you removed the engine.)
No telling you that you can't run injectors that are way too big for the engine.
Not going to tell you what happens when dampers are too small and can't control pressure surges.
Not going to teach you grade school math.
Not going to teach you about piston to wall clearances.
You and I are even...and done.
Have a great life!
Regards, Greg
You really don't get it. Everybody on this site already knows you are the most knowledgeable person when it comes to 928s and a lot of other cars. That has never been in dispute.
Everything I've learned to do better is because of your replies to 928 owners in need. Your DNA is everywhere on this site.
I regard your replies to be little bread crumbs of knowledge I follow to grasp 1/10 of what you know. It comes in the tools you recommend, the sealants you use and way you approach torqueing low torque bolts with your other hand to avoid over torqueing. I could go on and on. You have some serious wisdom and when you stop posting this site will poorer for it.
I've always bought you products (until you cut me off) not because you have the best price but because I've received much more from you in help, intentional or not, over the years. I wouldn't have a mild stroker almost ready to start without your guidance.
I owe 99% of everything I know to you in regards to 928 ownership.
You lash out when all I want is more civility. I think it has become so easy to say things in a way here we would never say to each other in person.
It can become very uncomfortable when you realize you have gone to far. Some would take a beat try a way to laugh it off and make amends. Others, well they start blaming 'woke' folks and liberals with all their 'feelings'.
Maybe that's easier. You do or not do whatever you want. Lucky for me I have google search and nobody can delete all their posts anymore.
Your wisdom lives on whether you like it or not.
I love you like brother. In fact, you remind me of them. Bastards all. :-)
07-04-2022, 01:13 PM
Measuring Cylindricity
