🔧 BUILD 1988 911 Hotrod Build

[GG Allin]

Lots of progress recently. The front pan is done short of paint. Went through the front suspension entirely, started reassembly. Fuel tank will go back in once everything is painted. Back on the road hopefully before June.

 

[greasy]

Love all of it, keep it coming!

 

[IDAFC21]

Always love seeing updates on this car

 

[GG Allin]

Car is basically done for now, it'll never be done. I'll always have something to tinker with on it. But the plates are renewed, insurance is renewed for another year. The car is together and will be heading up to Perfect Power in Buffalo Grove for some final dialing in, alignment etc...then it's time to enjoy it

.

 

[IDAFC21]

 

[Spivitz]

 

[GG Allin]

Just went right ahead and took the engine apart. Doing a full rebuild. Now that it's apart it's very clear that it didn't really need it. Engine was built around 20 years ago and previous to me has only "race mileage". It's getting a new crankcase, new lower compression pistons and new cams. Everything else will be refreshed and reused. Reason for the crankcase switch is the fact that someone messed with the engine number, no bueno. The new case is actually very closely date matched to the car, so there is that. Maybe I'll build the old one up as a spare. Also lower compression to get away from straight 100 octane. The engine dyno'd at 360hp 290 tq back when it was built. Hopefully it stays close to that.

 

[IceCreamAssassin]

Fuck Yes!

 

[IDAFC21]

woah

 

[Gav'sPurpleZ]

Not sure how I missed the updates over the last couple years but this is fantastic.

 

[Pro Stock John]

Cool build did you learn to weld? That's on my list of things.

 

[GG Allin]

Cool build did you learn to weld? That's on my list of things.

I took a crack at it but my neighbor for the most part did the welding.

 

[guspech750]

Love this!

 

[GG Allin]

As I continue to wait for engine parts, cylinders to be specific, I'm wrapping up my new carpet install. Very happy with the results so far. Lakewell provided the carpet set.

I waited 7 months for new pistons, now I'm waiting for cylinder replating to be completed, shouldn't be long.

 

[Z28Camaro]

Looks fantastic. I’m sad to see the high compression go but I wouldn’t want to have to pay the gas bill if I was driving it a lot!

 

[GG Allin]

Interesting thing I learned about the rods in this motor, they're roughly 134mm in length. I think they're actually 5.25 inches. Stock rods are 127mm and some of the newer GT3's have 130mm. From what I can gather this allows the motor to sustain higher rpms for longer (doesn't have to work as hard). If the cams are ground to take advantage of this, magic happens. Needless to say, the pistons are a one off set.

 

[GG Allin]

Looks fantastic. I’m sad to see the high compression go but I wouldn’t want to have to pay the gas bill if I was driving it a lot!

New compression ratio is 10.3:1

 

[01bluesnake]

Don't know how i missed this, but what an awesome project, brings me back to when i was a kid. My moms friend had a 911 that i got to out in a few times, which would of been late 80's. Always wanted one after that, was such a cool car.

 

[Pressure Ratio]

Interesting thing I learned about the rods in this motor, they're roughly 134mm in length. I think they're actually 5.25 inches. Stock rods are 127mm and some of the newer GT3's have 130mm. From what I can gather this allows the motor to sustain higher rpms for longer (doesn't have to work as hard). If the cams are ground to take advantage of this, magic happens. Needless to say, the pistons are a one off set.

The rod ratio effects the speeds of the piston in different areas of the stroke. That longer rod helps slow the piston speed on the mid stroke and at top dead center. Which should help with the higher rpm. Plus the pistons are typically going to have a shorter pin height and skirts. Making it a lighter piston. Definitely a nice upgrade for a hot rod motor.

 

[Mr_Roboto]

If you went from 12:1 to 10:1 you will likely lose about 6-8% power wise.

Looking this up curb is about 2700 on one of these? Should move pretty well.

 

[GG Allin]

11.5 down to 10.3. The engine architect, William Knight supplied me with new cams. He believes I might actually gain some power. I'll believe it when I feel it. He's seen good results with them in other engines. They're one of his his proprietary grinds. This was one of "his" motors when it was originally put together back in '99-2000. There's been a lot of aftermarket cam development in those 20+ years.

 

[Mr_Roboto]

11.5 down to 10.3. The engine architect, William Knight supplied me with new cams. He believes I might actually gain some power. I'll believe it when I feel it. He's seen good results with them in other engines. They're one of his his proprietary grinds. This was one of "his" motors when it was originally put together back in '99-2000. There's been a lot of aftermarket cam development in those 20+ years.

If he built it, I'd think that he'd be the person to know. I'd be curious if it would be at the expense of valve train longevity but I could see 20 year newer lobes doing better these days, especially with the advances in springs alone. Definitely not apples to apples. For that difference the you're probably talking 4%ish with the compression alone.

 

[GG Allin]

I've got a proper short block now. The wrist pin cir-clips were fun. Only one flew across the garage. I was able to find it though. Heads go on next, obviously. No gaskets between the heads and cylinders.

 

[GG Allin]

Cam timing.

 

[Mr_Roboto]

Those are some weird looking con rods.