Author Topic: Briggs 40ci Engine specs  (Read 840 times)

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Offline JGC403

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Briggs 40ci Engine specs
« on: March 13, 2018, 09:01:31 PM »
I'm having a difficult time trying to find engine specs on these engines.  The specs I'm looking for aren't published or they aren't consistent from different places.

Engine ID 402417  0660  01

Bore: 3.438"
Stroke: 2.156"
intake valve lash: 0.005"
exhaust valve lash: 0.008"

I need:
connecting rod length
compression ratio
Intake and Exhaust valve diameter
Intake and Exhaust valve steam diameter
Stock camshaft specs:
-valve lift
-duration @ 0.050"
-LSA
-degreed centerline
-exhaust port length

I would appreciate any info I can get.



Offline PJG56

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Re: Briggs 40ci Engine specs
« Reply #1 on: March 15, 2018, 07:34:16 AM »
Just curious,do you have this engine you want all therse specs on???
Paul Guptill  (oppy) #238modX
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Offline JGC403

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Re: Briggs 40ci Engine specs
« Reply #2 on: March 15, 2018, 01:02:42 PM »
Yea, haven't torn it apart yet.  Most of the information I need i can get once I pull it apart, was just hoping someone already new most of the answers.  The camshaft specs will take some time to figure out, but I think I can do it with a degree wheel and dial indicator.


Offline PJG56

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Re: Briggs 40ci Engine specs
« Reply #3 on: March 15, 2018, 03:27:19 PM »
If you know how to use a degree wheel you can,but not sure why you need all the stock info
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline JGC403

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Re: Briggs 40ci Engine specs
« Reply #4 on: March 15, 2018, 05:21:08 PM »
I have exhaust header design software.  All of the above info is needed for it.  I have seen a couple threads on exhaust length and diameter, trying to see how close those are compared to the software. 

Offline PJG56

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Re: Briggs 40ci Engine specs
« Reply #5 on: March 16, 2018, 06:44:08 AM »
If I remember right,the couple of stock cams I maped out a number of years ago were 225 dur@.050 lift and around .290 lift if not mistaken and LCA was like 114 I think ,this was a 42ci cam
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)