Introduction: K'nex V8 Engine

Picture of K'nex V8 Engine

this engine was my smallest engine yet, I also have a intructions video on youtube for this engine. GOOD LUCK BUILDING!!

Step 1: Crank Shaft

Picture of Crank Shaft

the first thing!!

Step 2: Pistons

Picture of Pistons

compact pistons, yet easy

Step 3: Crank Case

Picture of Crank Case

do not fill with oil!!

Step 4: Cylenders

Picture of Cylenders

for the pistens.

Step 5: Cam Shaftand Pushrods

Picture of Cam Shaftand Pushrods

the red conectors for the push rods should line up and stand up acuatly for the next step.

Step 6: Finishing

Picture of Finishing

Step hardest step, and last step!!


Duncan Codd (author)2013-08-19

I added two battery powered k'nex motors to a gear and it works great.

Boasz (author)2011-07-24

i've buidl your engine its in mine knex car now

Boasz (author)Boasz2011-07-24

another picture

the knex guru (author)Boasz2012-07-26


vonster (author)2011-11-20

how does the crank shaft connect into one piece so that when you turn the crank it moves as one? - thanks

zbrown2016 (author)2011-09-03

How do o connect the y connecter on the second step

needles300 (author)zbrown20162011-09-13

its atached to the short white rod in the mittle of the piston

joelr97 (author)2011-06-23

will this fit in my 74 nova? ; ]

needles300 (author)joelr972011-06-25

sure will ;D.

171292 (author)2011-03-28

If you wanted to, how would you add valves and rocker arms to this?

needles300 (author)1712922011-04-05

i forgot how. it shouldent be that hard to make

171292 (author)needles3002011-04-12

I've tried... and failed. I just don't know how! >:-0 I need to make this for next week for a school science fair, and I NEED HELP!!!! is there any models or anything that you used to help you in the makings of your engine or anything? Or, if you remember, could you contact me at please? Thanks!

needles300 (author)1712922011-04-12

i made this 3 years ago but if you wach my video---
you can stop the video when you see the valves, i used elastic bands for it but it wound work better with small springs. its all a got to help you so i hope it works out for you.

171292 (author)needles3002011-04-13

Thanks! The rocker arms are on and the engine works fine! :-D

lilbigmanb (author)2010-06-08


needles300 (author)lilbigmanb2010-06-09

thats what i did. it runs really well

superbestknex (author)needles3002010-11-26

instead of using black hinges can we use one gray connector and allternate through the crank shaft so its a v4 ND NOT A V8

needles300 (author)superbestknex2010-11-26

you could cut it to make one. it won't be a V engine, you would make it a inline engine.

kingofknex (author)needles3002010-09-26

mine wont run it just jams, should i build again??

needles300 (author)kingofknex2010-09-26

check the place were it is jamed and fix it

kingofknex (author)needles3002010-10-09

done that thanks a lot brilliant engine m8
ive got an update of it on my profile,

kingofknex (author)needles3002010-09-27

i found it, donjt push the rod into the white piston pushee thing or they dont turn

L-B (author)2010-10-23

how did you make the connection between the yellow en the gray rod?

I seriously don't get it =.=

TheFoofinator (author)L-B2010-10-28

You don't join them

making master (author)2010-09-04

can this power a gokart??

needles300 (author)making master2010-09-04

that would be one POWERFUL go kart. lol

kenxman1990 (author)2010-08-27

plz make vid on how to make the pistons

motor man (author)2010-08-11

wont it cease up if i dont oil it though lol jokes

needles300 (author)motor man2010-08-15

with a real engine lol

motor man (author)needles3002010-08-26

dude it was a joke it will not cease up its knex

Orange Oz (author)2010-08-19

this is the step that nothing fits together and the whole thing smashes into pieces right?

needles300 (author)Orange Oz2010-08-20

the green rods should snap on between the the red connectors

Orange Oz (author)needles3002010-08-22

Ah... Well I Kind Of Dismantled It But Thanks Anyway!

darkd3cimation (author)2010-03-10

no hes the wo(man) LOL

thanks for the disign i saw it a few  months ago and i made my own but bigger and with a 3 speed transsmision 1st,2nd,reverse,and park it also has rocker arms and perfect timing thank u i really like it

gunner (author)2009-12-17

would it be possible to instead of puting those black pecies on couldnt i use he grey ones

iceman1 (author)2009-12-06

 learn to spell!!!

tehpwnz0r (author)2009-11-15

You're the man

kingofknex (author)2009-09-03


Lowney (author)2009-08-21

We need more info on where the beige connectors go

Lowney (author)Lowney2009-08-21

wait never mind i've done it now!

Lowney (author)2009-08-20

you spelt pistons wrong, just to let you know

needles300 (author)Lowney2009-08-20


kingofknex (author)2009-08-01

can u upload a pic that i can c what to do on the second step on the 7th slide plz!

needles300 (author)kingofknex2009-08-05

the last pic shows you what you should do with the 7th pic.

kingofknex (author)2009-07-31

how long this take u to make?

needles300 (author)kingofknex2009-08-05

1 or 2 hours, depends how fast you are.

ww2freak07 (author)2009-07-03

Steps 8 to 10 are very confusing can you post some side pics of those?

needles300 (author)ww2freak072009-07-04

I don't see any thing thats confusing about it.

bluelarz (author)needles3002009-07-25

yes very confusing, i think those are pics of different sides, also later, we need close ups of the beige pcs and how they line up

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