SS Viper

[JP]

Before making the chassie ready for paint we fabricated all sheet metal/cover plates etc. The body it self is in composite, but in some areas we had to use 2 mm aluminum to get realistic function and fit.


When that was done and we were sure everything fitted perfect it was time to prepare the Viper chassi for paint. We stripped everything and left was a bare skeleton...weight about 350kg (800lbs)

[JP]

In march 2005 the engine development started. The initial plan was to have the engine done in 3 months...but it took years, many years to get it were we wanted it to be in performace.

The first mission was to find a V10 block that was straight and good enough for the project...I can promise you that all V10 blocks are not. The block received Darton sleves and landed at about 502Cui


Internals to the V10, nothing exotic, just standard American Super Stock parts :-)


The most challenging part of the engine build was the cylinder heads and the valvetrain. The heads alone took about 3 months of hard work to get them to flow at decent levels. To get there we had to go way offset on lifters and rockers, 3 different sets of custom made lifters/rockers were tested before we ended up with a functional set.


Next step was to design a plenum/intake that would work good with the two tiny Trottle houses that comes with a Generation 2 Viper. A long plenum, no dividers, no planes, only filled with injectors and fuel runners...the injectors were mounted in the center of the runner, inside the plenum.


This is how the plenum ended up looking. It works realy well above 4000rpm, but under 4000 it would have been impossible if we didnt have a fuel injected engine. To get the engine to work at low speed we had to remove 80% fuel at the rear cylinders and linear add fuel towards the front of engine (closer to trottle houses).
The guys who did the Dyno tuning in USA dind't bother to do that, so we spent two days in a chassie dyno to get the engine driveable...

[cutta]

JP, what type of power where you able to attain with the engine and where in the rpm range is it making its peak power.

[JP]

Still working on it, we've done a few changes since it was in the dyno room... Major changes when we had it on chassi dyno...time slips will tell.

Originally Posted by cutta

JP, what type of power where you able to attain with the engine and where in the rpm range is it making its peak power.

[JP]

How do I upload a video?..

[Jeff Lee]

Put the video on YouTube then copy the imbed link and place it here.

[JP]

Video below from Chassie Dyno.
We spent two days to get the engine run good under 4500rpm. The fuel map from when we had the engine in dyno room was a mess, but after 18 hours and several 2000-5000 rpm pulls we had a map that was ok. Its still rough but the car can now be driven at low speed.
One other thing we experienced on the chassi dyno was that all 10 spline disc centers doesn't have the same dimension specs. The clutch discs were stuck on the Jerico Input shaft so it was a mess to separate the gearbox from the bellhousing... :-/

[cutta]

[ame="http://www.youtube.com/watch?v=3HN9AjePyII&feature=share&list=UUQBxHHJcX3 xHHsC1AGGVmPw"]SS Dodge Viper Chassi Dynamometer day - YouTube[/ame]

This is the link to dyno video.

[GUMP]

Originally Posted by JP

This is how the plenum ended up looking. It works realy well above 4000rpm, but under 4000 it would have been impossible if we didnt have a fuel injected engine. To get the engine to work at low speed we had to remove 80% fuel at the rear cylinders and linear add fuel towards the front of engine (closer to trottle houses).
The guys who did the Dyno tuning in USA dind't bother to do that, so we spent two days in a chassie dyno to get the engine driveable...

I wonder if some of your tuning issues would go away if you regulated the pressure after the injectors? That way you would be guaranteed that all of the injectors are getting the same fuel pressure. It would also reduce heat soak related issues with the fuel in the rails. Or, am I missing something in this photo?

Love this project!!

[Jeff Lee]

The machine shop I use has some pretty extensive experience with the Viper engine. They've sold them to road racers mainly. They came up with the fix for the crank & oiling problems that Dodge swept under the carpet (if you brought your Viper to the dealer and had an oil pressure or worse problem, they were swapping out engines to keep the customer happy...and quite). They offered to share the info with Chrysler but were rejected.
So...what I do know is that they cured the fuel problems by going to a return style system. Call Bud Yancer up @ 520-568-3511 if you think he can help. Or maybe you do have it all figured out and your good. That's in the Town of Maricopa, Arizona USA and that would be PST.