Carbon buildup update

[Billy]

Well it was worth it for you Billy because Rob paid for it! Hehehehe.

Ha ha ...yes thats true.

One of the main reasons Rob's car interested me more than others was the fact Rob had done a lot of the work I was looking to do when I got one.

How is he anyway? Did his op go ok?

[SR71]

Yeah he's alright.....the old cripple!

I had a bit of a laugh at his expense yesterday. I'd left my B5 outside his house after it came back from the paintshop. Late that eve I went over to collect it with my wife. I'd texted him to let him know I'd be coming for the car, but he hadn't received the text. As a result, he thought someone was nicking my car, jumped off the sofa in great pain, and thought "How the hell am I going to explain to J someone's nicked his car??!!"

Hahahahaha.



We were going to go up Audi today and drop my B7 off and discuss the RS5 with the relevant salesman but in the end it didn't happen...

[ArthurPE]

re: walnut shells, Audi (amongst others) have used this method...it works, but the debris may cause more issues than it solves...
there is speculation that it has damaged the cylinder walls/coating on some Audi engines...

as far as increasing Q by port/polish/matching plenums, heads, exh manifold

from what I gather doing all of the above on a inefficient engine like a SOC 16V Chev push rod small block, may at best, yeild 3-5% HP...this on a engine with low hanging fruit, a very low vol eff to begin with...
the RS4 engine is already optimized: 2 intake valves, good port matching, well designed plenum, 4 cams/variable, etc.
there is not much to gain, maybe a % or two...maybe...

[Terry1948]

When I was younger Lotus cortina days and RS1600 I would have the engine blue printed and gasflowed. My question now is if polishing improves gasflow why are golf balls dimpled??

[Billy]

Yeah he's alright.....the old cripple!

I had a bit of a laugh at his expense yesterday. I'd left my B5 outside his house after it came back from the paintshop. Late that eve I went over to collect it with my wife. I'd texted him to let him know I'd be coming for the car, but he hadn't received the text. As a result, he thought someone was nicking my car, jumped off the sofa in great pain, and thought "How the hell am I going to explain to J someone's nicked his car??!!"

Hahahahaha.



We were going to go up Audi today and drop my B7 off and discuss the RS5 with the relevant salesman but in the end it didn't happen...

Ha ha ha....I shouldn't laugh really...but that is funny

as far as increasing Q by port/polish/matching plenums, heads, exh manifold

from what I gather doing all of the above on a inefficient engine like a SOC 16V Chev push rod small block, may at best, yeild 3-5% HP...this on a engine with low hanging fruit, a very low vol eff to begin with...
the RS4 engine is already optimized: 2 intake valves, good port matching, well designed plenum, 4 cams/variable, etc.
there is not much to gain, maybe a % or two...maybe...

That may be true, but I think every single person who has had the work done has seen a marked improvement on performance.

[pippyrips]

Yeah he's alright.....the old cripple!

I had a bit of a laugh at his expense yesterday. I'd left my B5 outside his house after it came back from the paintshop. Late that eve I went over to collect it with my wife. I'd texted him to let him know I'd be coming for the car, but he hadn't received the text. As a result, he thought someone was nicking my car, jumped off the sofa in great pain, and thought "How the hell am I going to explain to J someone's nicked his car??!!"

Hahahahaha.



We were going to go up Audi today and drop my B7 off and discuss the RS5 with the relevant salesman but in the end it didn't happen...

Yeah, it was just hysterical: roll:


Billy - on the mend slowly, hopefully won’t be too long before I’m back to normal.

Just to clarify what happened with my/now your car, she was indeed put back to stock after MRC opened her up again following trialling a VTA set-up with the crankcase feed.

As build-up was still occurring there was little point it keeping it as it was due to the side effects.

[ArthurPE]

that is very interesting:
so after 2k miles with the blow-by venting/cyclone seperator disconnected the deposits about he same as 6k miles (3 times as much) with the crankcase recirculated...

1 that tells me the deposits are not formed by blow-by/crank case venting and the cyclone is pretty effective...

2 the ones at 20k miles do not look 10 times worse than 2k, or even 3 times as bad as the 6k, ie, non linear...
they form quickly initially, and taper off, the rate of formation decreases...self limiting...

if I had to assign magnitude
2k 3
6k 6
20k 10

very interesting...
I'd like to see 50k miles, or more...

now granted, this is only based on 1 car, but interesting none the less...

[Billy]

Yeah he's alright.....the old cripple!

I had a bit of a laugh at his expense yesterday. I'd left my B5 outside his house after it came back from the paintshop. Late that eve I went over to collect it with my wife. I'd texted him to let him know I'd be coming for the car, but he hadn't received the text. As a result, he thought someone was nicking my car, jumped off the sofa in great pain, and thought "How the hell am I going to explain to J someone's nicked his car??!!"

Hahahahaha.



We were going to go up Audi today and drop my B7 off and discuss the RS5 with the relevant salesman but in the end it didn't happen...

Yeah, it was just hysterical: roll:


Billy - on the mend slowly, hopefully won’t be too long before I’m back to normal.

Just to clarify what happened with my/now your car, she was indeed put back to stock after MRC opened her up again following trialling a VTA set-up with the crankcase feed.

As build-up was still occurring there was little point it keeping it as it was due to the side effects.

Good to hear mate!

Also thanks for clearing that up.

[BlingBling]

My question now is if polishing improves gasflow why are golf balls dimpled??

The dimples create a turbulent boundary layer which remains attached to the golf ball longer than laminar flow resulting in a low pressure wake and a reduction in drag. Resulting in the ball travelling further than an ordinary sphere.

[Marcus-RS4]

interesting threads on the issue here: http://www.audizine.com/forum/showthrea ... or-RS4-4.2