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Engine finished - on the road/track again soon!

596 views 17 replies 11 participants last post by  ViperTony  
#1 · (Edited)
Time to liven-up this forum again!

It's been nearly 1 year since I last ran at COTA. My 2020 rebuild drowned in its own PCV oil vomit and glazed the cylinders/rings before I got the vent plumbing sorted out. What started at 449hp Feb '21 ended up at 391hp last October '24 with close to 25% ring leakage, but I still managed a Personal Best of a low 2:32 at COTA. Pulled the motor in April, but the no-pressure hone/re-ring was just finished near the end of September. We used honing plates this time, changed 1 pair of rod bearings that had a small speck embedded in one half, bumped the compression not quite a point with thinner gaskets and had to install some shorter pushrods to keep the Gen 3 rockers happy.

Hoping to have the car back together in a few weeks, shake it down a couple miles, then hit COTA again for a Sunday session first part of November. Another weekend or two in Dec/Jan to hit my sub-2:30 goal for the blue car, then it switches to mostly road duty while the racecar becomes my primary track weapon.

I've been tinkering with the racecar a few hours per week in the meantime going through the fuel system, oil and cooling circuits to my liking. Suspension is getting freshened, but the engine will need to come out with 2 holes having very low compression from stuck injectors.

More updates to follow as available...

 
#3 ·
Glad you used honing plates, they make a difference. A tighter squeeze is always good too - the disinformation around acceptable quench clearances have cost a lot of lost power for Mopar owners. New motor should restore lost power and add a little. Good work!
 
#6 · (Edited)
Very true. But when I've known the owner of the engine shop for 20 years and he's 10 minutes away, it goes back for the right stuff.
 
#8 · (Edited)
I had a busy weekend in the garage. I've had the car on the lift sitting on jackstands stripped of coilovers, brake calipers and lines since May. I rebuilt my front calipers in '23 and sent my front shocks to Penske for service at the same time. I just cleaned them up and worked on the rears this time around. I found a motorcycle racer and shock/fork specialist near here with great Penske creds, so he serviced my rear shocks.

In June, I detailed the entire frame, trans tunnel and wrapped some wire harnesses that were showing some wear. The suspension wishbone mounting bosses take a lot of stress when tracking them hard with sticky rubber and a number of racers have had them tear away. I've noticed all of mine had flaking paint around the welds on the frame, so I used a stainless brush and cleaned them down to bare metal for a very close visual inspection. Thankfully, everything looks good, so this weekend I masked off the wishbones, wheel wells and any frame members I didn't want any overspray on. I hit them all, along with the battery tray, with 2 coats of primer and 2 coats of semi-gloss black. They all turned out reasonably well, but not Dom - perfect!

I installed new, stiffer bump rubbers on all 4 shocks, installed the top eyes and set them so the rebound adjusters would all have 32 sweeps of adjustment. I got the main & helper springs installed, set the perches to the same height they were when removed, so the ride height should be pretty close. Got the cone spacers on both ends of the fronts and top of the rears, bolted them in and torqued the nuts. I loosened the swaybar adjusters to be ready for corner weighting when the powertrain is installed.

A few months ago, I rebuilt the 40mm rear brake calipers myself, because they were giving me lots of parking brake and pad drag troubles. Even with great online and phone help from "40mm" Rick - it was still a tough go. I had to have a couple of small seal screws machined for o-rings made from thumb screws I sourced from McMaster. It took some time, but I found an e-Bay store called Bigg Red in the UK. They stock every seal kit for Brembo brakes, and the prices are very reasonable - but it took several emails to be sure we were on the same page, then some wait time. The Lotus Elise uses the same calipers. I have to admit this is not something I want to do again - they are aggravatingly difficult to assemble, but I got them done correctly. I installed, torqued, hooked up the cables and lines, then did a gravity bleed at all 4 corners. I installed the rotors and pads at all positions, then vacuum bled everything again.

What was looking doubtful on Friday is now looking likely to be well ready for my November trip to COTA!




 
#11 ·
Edge Addicts Nov 8-9. 5 sessions per day. They have a Purple group (for racecars running under 2:20) called Track Rats who get to use the 2-story paddock lounge near the start of the garages. It's either a little rainy, or perfect track conditions thru the fall and early winter months. Chin motorsports will be at Eagles Canyon in the north DFW area is the same weekend.
 
#12 ·
I need to get to Eagles Canyon...... BTW they just did a pretty big overhaul to MSR Houston. Not a full repave of the track but they hit the worst areas I will be checking it out next month.
 
#17 ·
One week later - I partially dressed the engine/clutch and cleaned up the transmission on Saturday, then got the car down on 4 wheels for the first time since April. Sunday morning I rolled it out and got it up on stands to wait for my helper from across town. He was delayed due to a home accident requiring a few stitches, but once he arrived, we got the motor dropped in the driveway, then stabbed the trans with it on the lift in the garage. That process only took 3.5 hours! All engine, trans and mounting bolts were cleaned, Loctite'd and torqued to spec. I finished the evening routing the front wiring harness, hung the PS pump, hooked up some fluid lines. The pace of progress slowed down a lot after the big stuff went on/in. Now it's down to trigger work. A built, dry motor with light flywheel and water pump weighs right about 440#. Maybe it will be ready to crank up next weekend.