The 930 rebuild.........beginning to end, the process in pictures
06-26-2006, 05:09 PM
#1
Former Vendor
Thread Starter
The 930 rebuild.........beginning to end, the process in pictures
Started with loss of power - down 57 hp
Then 40% leakdown:
So let's take a look inside. Heads had been shifting on the cylinders:
#3 exhaust valve had 40% leakage:
Broken rings.....fairly common:
Shop recommends new ARP rod bolts......just in case.
Also getting ARP head studs in lieu of the Dilivars from the previous rebuild.
What ho? A wobbly rod? OK, let's take it down further:
Cylinders got very hot:
Rod bearing just about gave up......LUCKY, eh?
Then 40% leakdown:
So let's take a look inside. Heads had been shifting on the cylinders:
#3 exhaust valve had 40% leakage:
Broken rings.....fairly common:
Shop recommends new ARP rod bolts......just in case.
Also getting ARP head studs in lieu of the Dilivars from the previous rebuild.
What ho? A wobbly rod? OK, let's take it down further:
Cylinders got very hot:
Rod bearing just about gave up......LUCKY, eh?
06-26-2006, 05:11 PM
#3
Former Vendor
Thread Starter
So, that's the bad news.
Time to move on.
The parts:
98m Mahles:
Long skirt Mahle pi$tons:
Ni-resist ringed the cylinders and heads to prevent leakage and shifting (not a good pic):
Imagine Auto fuel head, checked/balanced injectors:
Time to move on.
The parts:
98m Mahles:
Long skirt Mahle pi$tons:
Ni-resist ringed the cylinders and heads to prevent leakage and shifting (not a good pic):
Imagine Auto fuel head, checked/balanced injectors:
06-26-2006, 05:12 PM
#4
Former Vendor
Thread Starter
Going with 7.5:1 pistons instead of 8.0:1.
After engine break - in, we will working our way slowly upwards on the dyno with:
Increasing boost (probably not exceeding .8 bar)
AFRs watched closely. Aiming for very low 12s.
Crank did not receive any damage at all other than the scratch in pic above. Needs only a polish.
Heads might be done this week.
I pick up injectors tomorrow.
Imagine Auto $500 'flowed' fuel head will be here today.
K27 Hiflow turbo needs no work and is in great shape.
Soon she'll be back doing this:
After engine break - in, we will working our way slowly upwards on the dyno with:
Increasing boost (probably not exceeding .8 bar)
AFRs watched closely. Aiming for very low 12s.
Crank did not receive any damage at all other than the scratch in pic above. Needs only a polish.
Heads might be done this week.
I pick up injectors tomorrow.
Imagine Auto $500 'flowed' fuel head will be here today.
K27 Hiflow turbo needs no work and is in great shape.
Soon she'll be back doing this:
06-26-2006, 05:22 PM
#7
Former Vendor
Thread Starter
Good question! Maybe. If the IA fuel head takes care of the fueling issues, then no.
It also depends on how 'wavy' (uneven) the AFR chart is on the dyno - then we night need it.
It also depends on how 'wavy' (uneven) the AFR chart is on the dyno - then we night need it.
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06-27-2006, 10:59 AM
#9
Rennlist Member
Hmmm. This looks and sounds all to familiar. Was you first motor built by Gamroth & Weiner?? Mine lasted a wopping 8000 miles before it self destructed and I sent it to Stephen to have it done properly!!
06-27-2006, 05:40 PM
#13
Rennlist Member
Here's what mine looked like after less than 8000 miles of road driving. The car was never tracked! It worked out to about $3.00 a mile, that's not counting what I had to pay Stephen to sort it all out.
The good part now is that Stephen's build makes nearly 30 more horse power at .4 bar less boost! Go figure! It should last many miles at .7 bar.
The good part now is that Stephen's build makes nearly 30 more horse power at .4 bar less boost! Go figure! It should last many miles at .7 bar.
06-27-2006, 09:17 PM
#15
Rennlist Member
Originally Posted by RSRS
1.1 bar? Who recommended that ???????
