Jerico 4 speed

[Ant]

USD$6200 includes shifter, yoke and bits like spigot bearing, driveshaft UJ's.

[BevanWright]

Ouch - they arnt cheap are they!

[Anthony]

Ant,

how did you decide which ratio's to get, what did you base it off of?

[Ant]

Anthony,

I am still working them out, but first I used the Richmond gear optimum calculator to get and idea of different combos. Then used either Smokemup and this one http://www.geocities.com/z_design_st...ion_z28_6.html

With my experience on local race tracks I thought whats the point in having an 85mph second gear and evenly spaced around that when some second gear turns are around 55-60mph and the engine will be off the camshaft, so I am going for a lower set with speeds of:
7000 on 3.27 with 25.6" tires
56
80
106
134
164

Some race guys have second/third/fourth all about 15-17mph apart to accommodate these turns. We used to have an air force base with really high speed corners so it didnt matter so much. Another point I am going to run more of a revver whereas if I went to a 406 race engine ratios would be less of a problem due to lower down grunt.

[BevanWright]

164 Ant? Where are your priorities? Hehe

Wont you miss the near 200mph?

[Ant]

Bevan,
I think those days are gone a bit, as the roads here arent that brilliant, and with the car will still do about 170mph at 7000.


I still havent ruled out an alloy BBC, we havent been able to get good build sheets on alloy SBF yet but have been in contact with Joe Fontana, he makes a mean cleveland block with good oil system, and there are plenty of high flowing alloy heads that are equivalent to the cleveland available. Decisions decisions.

[BevanWright]

I must admit - the airport circuits are all gone now - nowhere left to go that fast unfortunately.

I probably would go with a small block if I was starting from scratch - less torque, less power - can use it more!

[Clois Harlan]

Ok Scott I want to see the video! The one you post a couple years ago was tremendous. Reminds me of what I need to do to get closer to your times (since I can't hit that 8000 RPM mark like you do with your stroker I am going to need to finesse my gearing a little better).

Clois

[Rory428]

I have no personal experiances with the Nascar or road race Jerico 4 speeds, but I have been running a Jerico DR-4 in my 2 drag cars for some time now. It has been in my low 10 second 428FE powered Ford Fairmont for 6 race seasons, & this year I converted it to my 85 Mustangs 302. After hundreds of 6000-6600 rpm clutch drops, I have yet to hurt it whatsover. In fact, when we pulled it apart to change the gear ratio`s for the 302,this was the first time the covers were removed since I first installed it. Awesome race trans, but I certainly would not want to drive it on the street! In addition to the very noisy straight cut gears, there is considerable backlash when getting on & off the throttle. Although it shifts like the proverbial "hot knive thru butter" under full throttle, it does not like to be "granny shifted" (very crunchy noises!), nor does it take kindly to downshifting. Again, these are based on my own experiances with the drag racing unit, a road race slider equipped unit may be a totally different animal.

[Ant]

Rory428,

I think the road race sliders would be much easier to drive on the road than the DR4/DR5, I realise they are a race trans, but with a little bit of practise not a problem at all.

G-force make a real tough T56 with syncos and semi straight cut gears, but they are approaching $7kUS and 130Ibs......heavy!

With careful selection of running gear components weight savings of 50Ibs trans and another 85Ibs with an alloy engine = 130+Ibs.