Build Your Own Clone Motor

MAS

Premium User
I have the basic essential hand tools for doing small engines. Is it worth it to build your own engines? Im up in Canada where engine builders are few and far between
 

OVALTECH1

Premium User
They got nice short-blocks and completes that will be more than competitive on a local level!
 

1fasttiller

Member
I build my own, but after doing a couple of the short/long blocks from BSP they are hard to beat! Very good quality and almost impossible to do it yourself for that price. Just a caution, they are human so double check critical items. The last shortblock I assembled had the cam timing way off...
 

OVALTECH1

Premium User
I’m will second that as well... did a few of their builder kits that came as assembled shorts... upon taking them apart to set clearances to my liking I was glad I did... that being said I’ve seen big name motors the same way..just use your best judgement and check and double check things.... we’ve all had a hangover Saturday where we let a few minuscule things slide😂
 

alvin l nunley

Premium User
Being able to do, and knowing what to do, are 2 different things. Trial and error, over time, will help with knowing what to do. Buying a short block might be a shortcut to acquiring some of that knowledge. Find out what the experts are doing. Go from there. Hand tools? Does this include measuring tools? Micrometers, bore gauges, along with hone, CCing equipment, ignition timing tools, pop off gauge, compression gauge, some way to measure the cam timing? Gauge pens for checking the carburetor holes are always handy. Reamers come in very handy for adjusting jet bores and the holes in the carburetor. At about $20 apiece, a complete collection of "needed" reamers can get expensive.
 

flattop1

Dawg 89
What range clearance are you looking for ?
My guess would be .0015-.0025 .
 
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MAS

Premium User
I was always told to use .004 that it would make better power but I'm not well versed in that department
 

OVALTECH1

Premium User
I use no larger than .002 on mine I’ve run them as tight as .0015 and have seen no I’ll effects. When your max over bore is only .010 per stock class rules I like to keep as much meat for a freshen up as needed.
 

flattop1

Dawg 89
modern materials and piston design have tightened things up .
Or i'm just out in left field.
larger clearance's invite piston rock which leads to worn ring edges .
I would say if you want .004 you going to need to disassemble and hone it out too meet that .
 

OVALTECH1

Premium User
yeah no need for .004 in my eyes heck at .005 I’m looking to freshen the bore.
 

krtracer44

Member
There's a difference from a parts assembler ...and a race engine builder.. there's alot left on the table...it's all the little things that add up ..and that's why people pay for a high dollar clones .. because actual race engine builders have the knowledge and the experience ..and long hours behind these engines ...not saying you can't get close ....and it's really about those 4 black things hitting the track ....
 

krtracer44

Member
There's a difference from a parts assembler ...and a race engine builder.. there's alot left on the table...it's all the little things that add up ..and that's why people pay for a high dollar clones .. because actual race engine builders have the knowledge and the experience ..and long hours behind these engines ...not saying you can't get close ....and it's really about those 4 black things hitting the track ....
 
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