Question For Wisco Piston Kit Users

[79XS11F]

TC .. Have you left the needle jet clip in its stock position with this jetting?
Rob

[TopCatGr58]

Rob,

My 81 has only one position, and I haven't felt the need to try to mess with it with those little washers! The guy at the Dyno reviewed my results, and said that because of that little dip at 3500, that I could probably use a slightly larger main jet. Perhaps raising the needle a touch might do the same thing, but my plugs aren't very colored anyways, so I may try going up a size later!? Also, I've heard that with the 4-1 pipes I have, that this 3500 rpm "DIP" is common. I think some of the other guys have figured out how to reduce it with all of their Dyno runs and tuning, you might want to review them!
T.C.

[79XS11F]

Thanks for that info TC.
My Dial-A-Jet setup calls for running the main jet a on the lean side because the system will deliver the additional fuel up to 15 %. This makes selecting the right main jet a little more difficult. If I understand what your saying the added 79 CC is not a real big difference of concern. I already have #145 pilot jets installed and the rest of the jetting is stock. In you experienced opinion do you think the needed increase in fuel would be less then 15% of the total fuel requirement?
As you know my bike appeared to be running rich all the time and I adjusted the needle jet down one notch to lean it out but it is now running a little too lean even with the dial-A-Jet at full output. I am hoping that the increased displacement, headers, and ported/polished head will correct the rich situation with the needle back to stock position and the dial-A-Jet adding insurance against running too lean.
Rob

[79XS11F]

All for NOT :-(

Well I was just about to drop my head on to my block with the Wisco 1179 pistons installed and the F**King head gasket that came with the kit is defective. It is missing the steel inner ring at hole # 4. WOW am i ever disappointed after spending most of the weekend working on my hop up engine with the hope of switching the engines out on Monday evening. I bought this at the end of may so it is out of warranty and I am therefore not even sure if Wisco will replace this item. I hope so.
Rob

[Crazcnuk]

I am sure they will, as it's an obvious defect.

On Premium vs Regular fuel. The higher the octane, the slower it burns and the LESS horsepower it makes.

Premium was developed in order to get around the (relatively) poor designs of the 1960's.

If your really not sure if your getting detonation, you can buy the little knock sensors at any auto parts store. You attach it to the engine (head) somewhere, and hook it up to a dash light, or other light. You only need it on the vehicle for a while until you know whether or not your engine knocks anywhere in it's normal running range.

Drag racers do this all the time. I have the GM 502/502 Premium crate engine in my Monte Carlo, and it specifies premium fuel only. However, I have been running regular in it for the last 8 years in low 12 second runs with no problems.

[79XS11F]

Thanks for the info on fuel. I was also thinking of running a 50/50 mix or a 66/33 mix to be safe. It's easy enough to do as most gas stations now have 1 nossel and a selection button fir the grades.
Rob

[79XS11F]

WAY TO GO WISCO!!!!!!

OK.. I sent Wisco e-mail about the gasket on Monday but got no reply. So I phoned them and was directed to call the distribution location where the kit was shipped from. I spoke with a gentlemen named Frank who heard my story and promised to call me back within an hour. I did receive his return call within an hour and a new head gasket confirmed good by Frank will be at my door by the end of the day tomorrow.
Rob

[Crazcnuk]

Just a note on 'Premium' fuel. It starts to lose octane the moment it's put in the truck to go to the gas station. If your local gas station is not a very busy one, chances are the premium in the tanks is not much higher octane than the regular pumps.

Talk to the local drag racers, in your area, and they will know the gas station that sells the most premium, so you know you're getting fresh gas.

[79XS11F]

Good point. The station around the corner sells racing fuel and high octane and they are pretty busy. I am thinking that perhaps the way to go is with an octane booster additive. What do you think of this option?
Rob

[mro]

octane booster additive

When it makes a difference, it's when added to "lower" octane fuel. Have read articles on it and bottom line is that it's not cost effective and does little when added to "high" octane fuel.

Google it..............


mro

[Pat Kelly]

Does lower octane fuel lose octane too?

[Crazcnuk]

Yes, but since a lot more regular is sold, the tanks are filled more frequently.

Most stations get new loads of regular each week, if not more, but may not get premium more than a couple times per month.

[79XS11F]

Wisco had that replacement gasket in my hands before 4 PM on Friday :-)
SO ... After a rather long day in and out of the garage the hop-up engine is fully assembled and ready to install. My brother in law will be by at 10 this morning to help me do the switch off. If I work fast and careful I should be able to fire it up tomorrow after work. I intend to run it with my 1/2 drive inch drill to fill the oil galleries and make sure everything is as it should be before firing it up.
I am nervous to say the least given the cost and time I have into this engine but it's going to be OK or not.
I'll keep you all posted.
Rob

[79XS11F]

Well I have started and warmed up the engine. there was no smoke coming out of the exhaust but the idle was a little rough. i will have to sync the carbs tomorrow and finalize the timing. I let it run for about 10 minutes with a few fans pointed at the engine. She sounds NICE ans very throaty. BUT and this is a concern for me at this point in time ... just before I shut her down there was smoke coming off the head !!!! I HOPE it was just oil burning off the exterior surfaces. I hope so. I guess I will know soon enough eh.
So tomorrow I will re-torque the head nuts and do the timing. Top end is very quiet with no valve noise. I can hear the weiring sound and I will guess it is the new rings on those bores?
Rob

[79XS11F]

Better

I just came from the garage and while out there I noticed that the valve cover gasket was wet. well.. I have not torqued the valve cover bolts down yet. I guess I missed that when my brother in law arrived sooner then expected to help switch out the engines. This is an oversight that is GOOD news because I now know where that smoke came from. I feel relieved !!!!
Rob