how about some combustion chamber pics

[UK Luke 72]

[FreeBug]

[jpaull]

[mark tucker]

some ceramic coatinga are like a mirrior polished serface. Ive done many of those.woirks great. those ls guys have a little more$ and different engine than ours.along with probably a lot more sofistacated tuning ability. yes shinney works yes rough works.yes shiney is harder for the carbon to build ou on than the rough. and yes the ls has very good squish and can keep the carbon off eazer, the ls is also not a whoreazontle engine that tends to oil the cylinders just sitting, those ls engines also usualy dont tend to putt around like grandmaw thinking they are bad with thier rusty fenders and wonkey camber.....those guys build thiers like that to run...to out run....and to up grade and out run the next guys that think they are somebody...not just look at me Im a bug with a cam with a stinger trying to be skeery....look out I might bite you..as I idle around... yes I know there are a few guys that do drive thier bugs, mine was a true daily driver the entire 17 years I owned it. and no grandmaw ever drove it for thse 17 years. there are a very few like that.and a few that have some bad bugs that come out every so offten. . the argument of whoos got the biggest dick for sure isnat in the vw seen... but keep playing with it and it might explode on somebodys ls... now comes the argument of is ls the best?? fuck no it isant. it's the best gm has come up with so far.but yet these killer ls are usualy like our killer vw's ..nothing left of gm like nothing left of the vw..but perhaps a gear or 2. so back to the head posting!!! ( no dickheads please) eye wood post some pics but I dont remember how and...my drop box is...gone. effing puter crash from win10, now back to 7 and havent put drop box on it. Im waithing for the earth quake. side note my 13.8 cr 340(v had polished chambers and pistin tops.masive amount of squish, about a .800" x.350"deep flame hole/fire hole in the piston dome,had no pinging issue at all with pump gass and no carbon buildup issues either on head or piston. 2, 830 cfm hollys on tunnel ram,r278 roller. daily driver daily 8000 rpm shifts. 3 year tear down intervals.most just for the fun of it.or to try /add something small to seee what it will do or not. at 1 point it had divited inserts in the intake runners to see a change.as a result I could leen it down just a tad.( narrow band on that car back in the late 80's so awsome for tuning!!) there was also massive amount of expensive epoxie in the ex ports to make then almost 1/3 smaller with a better shape. that was one money making car.one that I wish I had never sold off to build a new car. i sure miss it. funny it had the same stroke as my 2332 but it had a 6.125" rod it would come to life around 4400 rpm like pushing the button. oh somuch fun. my 2332 had good tq the entire power band with the 5.5 rods...and a lot smaller cam. thus the reason why I pulled it down to put in a roller....way tomany years ago.

[sled]

[Dauz]

The greatest trick Mark has ever pulled was convincing the world he was actually incoherent.

[Lingwendil]

[oprn]

[Chickensoup]

[sled]

[modok]

[sled]

pretty similar but laid back on the plug side a bit more. Maybe the short turn air speed likes a bit more room to make the pressure drop more even around the valve?
_________________
drive your split.

[Dauz]

[Floating VW]

[mark tucker]

[fuguboy]

I got a question about chambers, is it best to go out to the bore? I need to get some cc’s and looking at these pictures looks like most are at or close to the bore. Thank you for any info.

[Brian_e]

Yes, but don’t get carried away. Blowing out the side walls kills pressure recovery into the chamber.

If you need to gain a couple cc’s, remove it from the plug side of the chamber. Don’t remove anything from the non-plug side. With unshrouding, a little non-plug side work, and a valve job, you are only gonna gain about 3-4cc.

I find it much easier to dish the pistons with a round dish the diameter of the smaller part of the chamber. This will keep good size squish pads.

Brian
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www.type-emotorsports.com

[BFB]

Just because i know no one else will say this because most everyone believes you have to have squish. I had a set of empi heads that were 45cc chambers and i hogged the whole thing out and got over 10 more cc’s. I “domed” them like the LS guys do for boosted applications ( which is what i was doing ) just mine are more tapered on the plug side and it goes almost to the cylinder wall.
Been running it 5 years or so now and even in 100 degree Missouri weather…
Not saying squish guys are wrong, this is just my experience with not following the “rules”.
_________________
Forced induction can overcome a lot of obsticles that gets in it's way
"You are the Engineer and the Mechanic.  
Build it your way not the way someone else does it. Their way might not work for you." - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
“ The monkey see monkey do mentality seems to run deep in VW people. "Gene Berg said it was so 30 years ago so thats the way it is" “ - bdkw1

[mark tucker]

bfg has forced squish. I try to stay about 1 mm from the cylinder when unshrouding valves and make sure it has a raidi( not sharp) as for thermal barrier stuff...I love it. chambers, ex ports,valves, piston tops, headers. hell my house has it in the attic as welll as the paint on the west side brick wall that gets a shit load of sun hear in florida. it works. Ive pulled appart super charged engines with it that the pistin tops were fine but the rings were gone due to bad leen out witch would of melted a uncoated piston& burt the head.(chmbers and pistons were coated.)

[sidemarkers]