Odd knocking

[IceCold4x4]

LOL thought i had about thrown the rod out the block this sounded so bad trying to limp home the other night. Though when i pulled fuel to the #3 cylinder the problem was fixed but i did get to limp her home on 3 cylinders which is still enough power to spin the tires lol.

here's some pics of the final damage.








lol and this is the silicon hose that busted oh well. holds 20 PSI now.

[maxpsi]

I can't tell much from the pics. Anything other than a blown hg?

[IceCold4x4]

just a little bit of detonation damage, that's all cleaned up now, got a special trick in store for everyone, I'll show it tommorow. Gonna try something called grooves lol. Supposed to help with knock resistance.

[RedSuperRanger23]

you were planning on some headwork right? seems like the perfect oppurtunity to me.

[IceCold4x4]

I was thinking of putting the new head on, though the bottom end is not in as good shape as I'd like. So I've decided to go with a rebuild on a different block go with some serious stroker stuff should be able to punch it out to like 2.8 liters. Should make for an even torquer(sp?) motor than this one lol. prolly be near 400 RWFT/LBS.

I'd hate to put the good head on this block just to throw a piston into it ya know? especially when these new heads are a PITA to find.

[IceCold4x4]

btw cleaning a cylinder head is just a dirty ass job. really. I'm wondering though how there is black stuff under my arm pit? really WTH?

gonna do a bit of porting i think tommorow maybe and get the grooves started.

[IceCold4x4]

well here's the idea see what y'all think









supposed to provide better detonation resistance at High load low VE like when boost comes on real quick at low RPMS. We'll see how it works. . .

BTW i just redid it a bit for deeping the grooves and went further back into the squish pad.

[topnotchtsi]

Very interesting. I have never seen that before. Keep us updated on how it turns out. Are there any ill side effects? I would like to know more how it helps with the detonation exactly.

Keylan

[IceCold4x4]

from what i gather it helps improve swirl, ( at least that's the theory behind the 3 at the bottom) and direct jets of air fuel mix toward the spark plug to help flame propogation. I'm not an expert on it but going off another head, but adding my own personal twist. As far as I've heard no ill effects. It also should help burn the part that is in the squish area. Essentially a more complete and faster burn.

they are called somender singhs grooves or something like that.

http://www.somender-singh.com/ for more info.

[phalse]

I'm far from an expert, but that goes against alot of things ive read and seen. It is often recommended when building a motor, that you buff down the sharp edge of the valve reliefs in the pistons and any other sharp edges, as these sharp points can make a hot spot. When looking at cylinder heads for motors such as the 6g72, dynamic racings stage 3 heads, proven to run more boost with less knock on pump, claim their porting and cleaning of the cylinder head reduces detonation, and one of the things they clean up is the nasty casting marks in the area between the valves, which is certainly less of a angle than that. I'm really not sure how what you show is supposed to help. Any links to any docs on it or testing stuff? Would love to read up on it.

[TBone]

Originally Posted by phalse

I'm far from an expert, but that goes against alot of things ive read and seen. It is often recommended when building a motor, that you buff down the sharp edge of the valve reliefs in the pistons and any other sharp edges, as these sharp points can make a hot spot. When looking at cylinder heads for motors such as the 6g72, dynamic racings stage 3 heads, proven to run more boost with less knock on pump, claim their porting and cleaning of the cylinder head reduces detonation, and one of the things they clean up is the nasty casting marks in the area between the valves, which is certainly less of a angle than that. I'm really not sure how what you show is supposed to help. Any links to any docs on it or testing stuff? Would love to read up on it.

I agree. I have always heard the sharp edges get warm, become hot spots and actually premote detonation. If this works I would like to understand how.

[AznIKON]

very interesting! ...

[IceCold4x4]

http://somender-singh.com/content/view/74/52/

theres a little dose of it, though read more around that site. I agree with you too about the hot spot idea but I'm sanding all of it down to smoother transitions.

Worse case senario it's worse than before and i grab another head from the junkyard. A few people on the Volvo boards have done it and say they like it so it's a trial for me.

http://forums.turbobricks.com/showth...t=66779&page=1

20 page long thread about everything.

btw I'll take some pics later but everythign is more smooth now btw.

I agree with you phalse in that it does go against alot of stuff i've always been told but Eh you gotta try new things to get an edge sometimes.

[TBone]

Its an interesting idea.

[IceCold4x4]

I'll let you know tonight if it screwed my head or makes a difference.

hopefully it'll let me run some more boost out of the hole, and be able to get a bit closer to 12's . . . gotta catch up with them vettes.

[phalse]

That thing is such an awesome sleeper. Hope its back out soon!

[IceCold4x4]

ok seriously WTF?

Just went for the first test drive, held boost to 5 psi, and WOW i mean i though the bottom end on this car was nice before but this is really like driving a V8 now. better throttle response and seemed to idle smoother.

Gonna have to go to the dyno soon and see if it made any real HP gains. . . .

really at this point all i can figure is that it seriously improves swirl, and aids in a more complete combustion. but man there is a nice diff now.

[TurboGTI]

u sure it's not just a variance in the calibration of your buttocks dynomometer? LOL. I'd be interested to see some dyno results. Glad u got it back together and running again.

[IceCold4x4]

it'll get dyno'd but for now it's the off boost situations and as boost comes on that is SOO much better. and well ya the butt dyno isn't the most accurate but the feel is there. At 5 psi it feels like it used to around 10 psi so that's a noticable change not sure on the top end results yet but it runs smoother though.

[IceCold4x4]

eh well i figured out what was going on with my boost, turns out i had a leak that was leaking under boost going to the gauge but sealing back up in vacuum so all is well and ya it does still spool a bit quicker and will spin the tires at about 3 less lbs of boost. can't wait to get some time off to strap her down on the dyno. guess I'll be back out next sat night. . .