Nice engine. Just one quick question. Is there some sort of fuel pump used ? The tank looks like it's sitting below the carb a little. I know this engine is a four stroke but small two strokes use crank case pulses to actuate a small diaphragm pump and also the fuel tanks run slight positive pressure to help move the fuel.
No there is no fuel pump. The top of the tank is just a little below the main jet orifice. The engine pulls enough vacuum to run out the whole tank even when it gets down to the bottom.
You have a very nice collection of engines - I'm at 2 engines finished and one crank so far! The V engines I've seen use one carb per bank to get the breathing right - David Parkers Vega twin started with one and migrated to two carbs to improve running. Be interested if you've done any work with the carb configs on this one.
Given the fact that these small engines are really picky about carburetion I had never given any thought to using 2 of them. I don't know if the performance would be better or not. I do know that I had vapor locking problems with the heat backing up the manifold and into the carb so I had to put insulator pads between the manifold and heads. With 2 carbs being so close to the head I would think this could be an even bigger problem.
It all depends on your machining abilities and the equipment you have available. To some people it might not be too hard but if you don't have much machining experience it would be extremely difficult.
I grew up in the late 50's and early 60's, probably the heyday of hot rodding and engine building. I learned most of my engine knowledge at this time, hanging around with older guys that did their own car and engine work. I got into machining when I got drafted into the Army during the late 60's. I then served an apprenticeship with the Ford Motor Co. as a metal patternmaker. I have a small shop in my basement, mill and couple of lathes.
@gbritnell thanks for you service ,got alot of vets in my family,o ok i see ,did you cast any of the engines maybe the v8 or 4 cylinder or machine out of a solid block of metal
is the pistons in their forged
looking to build big engine regular size ,or least try 2
There are no castings in any of my engines except the Holt. I purchased the intake and exhaust manifolds and the large flywheel. Other than that all the parts are scratch built from bar stock. The pistons are generally made from 6061 aluminum but sometimes 7075 aluminum.
I sell the drawings for this engine. There are 16 sheets in the set which includes a construction CD. The build sequence can be seen on the Home Model Engine Machinist forum under V-twin.
You totally have the best narrator voice on youtube. Please say "Prime time, Warner Channel" on your next video! It's so good that I completely forgot about the engine (and I love engines), and was thinking about your voice.
Oh BTW, amazing engine. The thing's I'd do to build a two stroke V10... but oh well, I haven't a CNC machine so I can't build one. Unless of course you know of a way to machine parts accurately without one, in which case I'd thank you dearly for telling me.
@corotor12345 i'm the exact same way....all i have a very simple hand tools and a drill..but i've seen people on here who built engines with just that...
@corotor12345 No need for CNC to build these things. Look up Nemett 15s. Built from barstock detailed step by step build in "model engineer". You do need a manual lathe, patience and time though. Look on YT for Whittle V8 - only manual lathe and mill, to do that, no castings. PDF's online somewhere - so you can do it if you want - lots of online help at HMEM and ME forums...
I guess at some point everything is for sale. With the amount of hours that it takes to design and build one of these the cost is quite high, much more than most people are willing to pay.
perfect. what is the best degree for beter performance? i know this is 90 degree. but just wanted to know what if we keept 45 or 50? what will be the effect?
I started designing it late last August and started building it in October. I finished building it around the middle of March. As I built it I kept updating the drawings so that they would be accurate. I'm guessing with design and build time i have about 500 hours wrapped up in it.
If all else fails, you might try scavenging the exhaust
ccryder1149 1 month ago
cool little engine I see it is like a Harley vibrating the candy in the bowl LOL
chuckbear1961 5 months ago
Nice engine. Just one quick question. Is there some sort of fuel pump used ? The tank looks like it's sitting below the carb a little. I know this engine is a four stroke but small two strokes use crank case pulses to actuate a small diaphragm pump and also the fuel tanks run slight positive pressure to help move the fuel.
satanicmechanic86 6 months ago
@satanicmechanic86
No there is no fuel pump. The top of the tank is just a little below the main jet orifice. The engine pulls enough vacuum to run out the whole tank even when it gets down to the bottom.
gbritnell 6 months ago
You have a very nice collection of engines - I'm at 2 engines finished and one crank so far! The V engines I've seen use one carb per bank to get the breathing right - David Parkers Vega twin started with one and migrated to two carbs to improve running. Be interested if you've done any work with the carb configs on this one.
Regards Steve
swithnell 6 months ago
@swithnell
Given the fact that these small engines are really picky about carburetion I had never given any thought to using 2 of them. I don't know if the performance would be better or not. I do know that I had vapor locking problems with the heat backing up the manifold and into the carb so I had to put insulator pads between the manifold and heads. With 2 carbs being so close to the head I would think this could be an even bigger problem.
gbritnell 6 months ago
you need a better carburettor for that, with an idle and a load section. Nice little engine by the way.
t28cj 6 months ago
You guys who can use Lathes and such are like gods to me.
I can't use a screwdriver correctly.
hammerogod 6 months ago
that thing is bad ass
MegaYoursister 8 months ago
Home Model Engine Machinist forum
do you know any other good engine info building websites
looking to build and engine thanks keep up the good work
richardarichter123 11 months ago
@richardarichter123
The Home Model Engineering Machinist (HMEM) has a wealth of knowledge and information on building engines.
gbritnell 11 months ago
super nice engine is dificult to make one of these engines
richardarichter123 11 months ago
@richardarichter123
It all depends on your machining abilities and the equipment you have available. To some people it might not be too hard but if you don't have much machining experience it would be extremely difficult.
gbritnell 11 months ago
@gbritnell o ok yea done some machining before
thanks for the feed back
richardarichter123 11 months ago
@gbritnell do have some machining skills and been working on cars and bikes for a long time
richardarichter123 11 months ago
@richardarichter123
I grew up in the late 50's and early 60's, probably the heyday of hot rodding and engine building. I learned most of my engine knowledge at this time, hanging around with older guys that did their own car and engine work. I got into machining when I got drafted into the Army during the late 60's. I then served an apprenticeship with the Ford Motor Co. as a metal patternmaker. I have a small shop in my basement, mill and couple of lathes.
gbritnell 11 months ago
@gbritnell thanks for you service ,got alot of vets in my family,o ok i see ,did you cast any of the engines maybe the v8 or 4 cylinder or machine out of a solid block of metal
is the pistons in their forged
looking to build big engine regular size ,or least try 2
richardarichter123 11 months ago
@richardarichter123
There are no castings in any of my engines except the Holt. I purchased the intake and exhaust manifolds and the large flywheel. Other than that all the parts are scratch built from bar stock. The pistons are generally made from 6061 aluminum but sometimes 7075 aluminum.
gbritnell 11 months ago
@gbritnell ok thnks alot yea famillar with the grades of aluminum like the 7075
richardarichter123 11 months ago
ummmmm....plannnns? pretty please? :)
5 months work deserves sharing :)
headsmess 1 year ago
@headsmess
I sell the drawings for this engine. There are 16 sheets in the set which includes a construction CD. The build sequence can be seen on the Home Model Engine Machinist forum under V-twin.
gbritnell 1 year ago
where do I find designs to build an engine of this?? drawings or manuals which have relied to build your engine?
creater448 1 year ago
@creater448
This engine is my own design. It took about 5 months to design and about 6 months to build.
gbritnell 1 year ago
Casualy shuts it down after some smoke starts to come out the right cylinder. :D
adamjamesroe 1 year ago
is this running on nitro or petrol?
crazystufffff 1 year ago
@crazystufffff
Petrol (gasoline) 86 octane
gbritnell 1 year ago
You totally have the best narrator voice on youtube. Please say "Prime time, Warner Channel" on your next video! It's so good that I completely forgot about the engine (and I love engines), and was thinking about your voice.
Oh BTW, amazing engine. The thing's I'd do to build a two stroke V10... but oh well, I haven't a CNC machine so I can't build one. Unless of course you know of a way to machine parts accurately without one, in which case I'd thank you dearly for telling me.
corotor12345 1 year ago
@corotor12345 i'm the exact same way....all i have a very simple hand tools and a drill..but i've seen people on here who built engines with just that...
scbjgs 1 year ago
@corotor12345 No need for CNC to build these things. Look up Nemett 15s. Built from barstock detailed step by step build in "model engineer". You do need a manual lathe, patience and time though. Look on YT for Whittle V8 - only manual lathe and mill, to do that, no castings. PDF's online somewhere - so you can do it if you want - lots of online help at HMEM and ME forums...
CastrolJets 6 months ago
like how much?
gauthier6916 1 year ago
would you sell it?
gauthier6916 1 year ago
@gauthier6916
I guess at some point everything is for sale. With the amount of hours that it takes to design and build one of these the cost is quite high, much more than most people are willing to pay.
gbritnell 1 year ago
If you go to the HMEM forum and search for V-twin you will find the complete build of the engine along with all of the statistics.
gbritnell 1 year ago
ohh ok tx....chain or push rod system? degree of timing...?
mechautoclinic 1 year ago
perfect. what is the best degree for beter performance? i know this is 90 degree. but just wanted to know what if we keept 45 or 50? what will be the effect?
mechautoclinic 1 year ago
@mechautoclinic
Supposedly a 90 degree engine has better balance than a 45 degree twin. Other than that I don't think it makes any difference.
gbritnell 1 year ago
I started designing it late last August and started building it in October. I finished building it around the middle of March. As I built it I kept updating the drawings so that they would be accurate. I'm guessing with design and build time i have about 500 hours wrapped up in it.
gbritnell 1 year ago
how many hours do you have in to this engine?
superfunnyman123 1 year ago
I think the gas tank needs to be higher. Good job though!
jdman1930 1 year ago
Yay!!! I have waited for this moment for a long time now!! Very nice job George! :D
randomenginestuff 1 year ago
Very nice!
Cletrac 1 year ago
Soooooooo cool!!!!!!!!!!!!!!
robert1352 1 year ago
nice work!
Bobbymitchell10 1 year ago
Great work, really excellent!
I like the sound of it, and it looks great too.
5*!
steamwally 1 year ago