Crazy Eddie

Thanks

sunnyr

For 997 GT3, Porsche warned against switching to a lightweight single mass flywheel - something to do with harmonics backing out bolts. Lot of people did this switch and had blown engines and Porsche refused to cover it under warranty. Check these threads - https://rennlist.com/forums/997-gt2-...-flywheel.html

https://rennlist.com/forums/997-gt2-...cking-out.html
https://rennlist.com/forums/997-gt2-...-on-gt3-s.html

Any such issues on GT4?

BGB Motorsports

Just to reiterate, we try not to sell anything we haven't run on a race car in an endurance setting. Nothing in the GT4 architecture is foreign to our history on track. From our pulleys to our flywheels to the Guard LSDs, it's all been run well in excess of anything you have intended for it. The crank conversion will get the same abuse from my daily driving and going on track.

BGB Motorsports

I figured I would just update you guys because it's been a week now; I'm waiting on bearings from Porsche that had to come out of Germany.

I walk by my motor every day with the same reaction I had when I pulled the engine off my parents' leaf blower and bolted it to a cracked go kart chassis i found. Do they make an emoji that conveys a feeling of "WTF did I just do?!"

Beantown Kman

Hmmm. The kid who puts the leaf blower motor on a go kart grows up to be a hot rodder in Porsches. Can't imagine how that happened!!

BGB Motorsports

Beantown, I never even thought about that correlation. I had never driven a go kart at the time and when I asked what size motor goes on the back, everyone said 2.5HP. Across the garage was our leaf blower that had the 3.8L...I mean 5.0HP motor. Just as you say, the rest is history.

Photo attached in case anyone cares to see what happens when someone insane is let loose with knowledgeable employees and hand tools.

Beantown Kman

^^^ So cool that you are doing this. Hands down favorite thread on this forum. Can't wait to see the outcome. I can already feel the ground rumbling.

neanicu

Is that the engine that came out of the GT4? If yes,it can't have more than a few hundred miles... Why are those piston heads so carboned up?

BGB Motorsports

agreed. 2200 miles; 1300 highway, 500 track and the rest street driving!

d00d

Any carbon buildup around the intake valves?
I'm afraid to look at what's going on in my Direct Injected Audi V10 at 105K.

neanicu

Unfortunately my fears are coming true again : DFI=problems. Oh boy! Disappointed about this one! I had better hopes with Porsche DFI because of the angle the injector is spraying,but it looks like that's not the case. The only solution is on demand port injection in addition to direct injection.
Did I tell you how much I hate DFI engines again?!

ChrisF

Any interesting finds while disassembling the engine? I'm guessing you and DeMann are the first ones to see the insides first hand

Crazy Eddie

I think they are working together on this stuff ?
Boy that is a lot of carbon build up !!

BGB Motorsports

I know what you guys are seeing looks scary but it's not anything that should be cause for concern. They look like the top of every other DFI piston I've seen come from a motor that has been run. I haven't seen anything that is enough to spook me. If it was still 2009 I would say we were the only ones to have been inside these things but at this point a lot of people have been inside here. The 997.2 turbo motor is based on the 9A1 DFI motor so there are now several folks who have been inside these motors.

neanicu

I wish I'd be less concerned about this... Is there any chance you have a pic with the valves?
Thank you.