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TFD and THD Magneto

Zira

Subscriber
Last Subscription Date
03/24/2019
Re: tfd and thd magneto

But, as you probably know, they are not interchangeable since the engines have different firing order. I have had single cylinder Wisconsin with modified 2 cylinder magnetos on them "farm engineered"

---------- Post added at 06:22:58 PM ---------- Previous post was at 06:20:13 PM ----------

But, as you probably know, they are not interchangeable since the engines have different firing order. I have had single cylinder Wisconsin with modified 2 cylinder magnetos on them "farm engineered".
 

Heins

Subscriber
Last Subscription Date
01/02/2020
Re: tfd and thd magneto

Isn't it the TJD that doesn't fire evenly?
 

Andrew Mackey

Moderator
Last Subscription Date
05/14/2017
Re: tfd and thd magneto

I believe the TJD gas a 180 crank, the throws are 180 degrees apart. - sounds like a John Deere twin when running. The others use a 360 crank - both pistons hit TDC at the same time, only one under compression. Harder to balance but smoother operation. The TJD mag will have 2 high tension outlets on the cap, next to each other. The others will have the posts opposite each other, 180 degrees apart.
 

K-Tron

Registered
Re: tfd and thd magneto

Andrew, the magneto on a TJD will have two high tension outputs, one higher than the other. The magneto with dual outputs side by side fits the even firing Wisconsin Twin's (TE, TF, TED, TFD, THD). In fact the entire magneto from a THD will swap onto a TFD and vice versa.

Chris
 

Zira

Subscriber
Last Subscription Date
03/24/2019
Re: tfd and thd magneto

My apologies, I misread the original post. Not enough coffee I guess.
 
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