How to increase compression on the CHEAP (Mopar 440)

Рет қаралды 28,090

Andy's Speedshop

2 жыл бұрын

This method will work for pretty much any American engine that was produced before and after the smog Era.

Пікірлер: 49

@georgesam7805 Жыл бұрын

Hands down one of the funniest videos on KZfaq. You guys are gonna get tons of views with this stuff !! Purely genius

@moparnut6286 11 күн бұрын

Cool budget work... You earned my sub.

@larryburns4605 2 жыл бұрын

If you cut a large washer put in between rod and piston to support so your not squeezing piston helps a lot and don't damage piston

@julesroman 2 жыл бұрын

I like the high tech tools at the end!

@furyfantoo Жыл бұрын

To put some context to the pistons - mid-late 70s 440s have pistons that are .150-.160" down in the hole. They are rated around 8.2:1 give or take, but in reality are < 8:1 as Andy said.

@Mynextproject_74 2 жыл бұрын

Great video!

@curtisalan4402 Жыл бұрын

And,, turning the pistons around on the rod reverses the factory dampening effect sending your 440 into higher rpms quicker.

@rchydrozz751 Жыл бұрын

This can be done on many engines, not just Mopars. It works. Something many people dont realize. On some engines the wrist pin bore on the piston is not centered.

@EamonnSeoigh 2 ай бұрын

Backyard mechanics learn through their mistakes. We’ve all been there….long before KZfaq..if there was such a time.

@Nobody-ld7mk Жыл бұрын

Deck the block until the pistons hang .010 out of the hole and mill the heads to boot, another easy point of compression in that upgrade.

@vincemajestyk9497 Жыл бұрын

That's a shitload of metal to take off! Why not just turn it into a lo block? Destroy the block and take off over .170' of metal to keep the lowest compression pistons ever made for that engine? As much as you cut off the block or heads you'll need to trash the intake and take more off that. Just do it right and buy new pistons. It's a hell of a lot cheaper.

@hansmayer9592 2 жыл бұрын

Do you plan on doing any more videos about your low comp 440? I really enjoyed this one. A complete series of your 440 build would be very interesting to see.

@andysspeedshop7148 2 жыл бұрын

yeah man! Once I have enough money to finish it I will post more about what cam/heads/tq converter I used. I appreciate it!

@hansmayer9592 2 жыл бұрын

@@andysspeedshop7148 Awesome! Looking forward to it!

@sinatralerby7545 Жыл бұрын

would know where i could get a set? got a 77 or 78 440 that is in amazing shape all it needs are those pistons

@rickyfulks889 Жыл бұрын

Genius

@danielslocum7169 2 жыл бұрын

changing the pistons; what a novel idea!

@andysspeedshop7148 2 жыл бұрын

The idea is where to find dirt cheap ones and how to make them work without a machine shop

@rickyfulks889 Жыл бұрын

Quality

@marioncobaretti2280 Жыл бұрын

Its not only the pistons that matter on there height but its the chambers in the heads. 906 or 915 castings on your heads are what you want. I wouldn't worry about balance , hone your cylinders as long as the runout doesn't exceed 3 thousands then put it together

@slowg8701 2 жыл бұрын

Did you put a higher compression height piston in vs the stock ones?

@andysspeedshop7148 2 жыл бұрын

yes in 1968 the advertised CR was 10:1 I believe. when I ran the numbers with my set up it was 9.2:1 but still a lot better than stock

@dicktomasko1553 Жыл бұрын

Usually you balance the pistons separate then the rods and pins...Always use stock oem head gasket style metal gasket..Aftermarket are mst times too thick.

@vincemajestyk9497 Жыл бұрын

That was a gruesome balancing job to watch. Probably didn't even need to be done as long as they were all about the same. I bet unbalanced it wouldn't be any worse than it was balanced at new.

@scotthultin7769 Жыл бұрын

First thing you should have done to them connecting rods as polished side of the beam to get rid of the seam that's a stress crack that's a place where the rod will eventually break is because of them stress once and then you wouldn't have so much to take off you got to measure the pig in and you got to miss you little and separately to make sure you got it balanced until you get that configured you're just making a mess out of your motor

@elebeu Жыл бұрын

What?

@cygnus1965 Жыл бұрын

Dafuq? You have no clue what you are talking about.

@karlbaker1943 Жыл бұрын

Put Closed chamber heads on

@groomlake51 Жыл бұрын

Zero deck the block and get the quench under .030” and that wakes a RB right up!!

@b.c4066 Жыл бұрын

You really run them tighter than .030" seems pretty tight for a pump gas street engine with OEM style parts. The tolerance stack was not as consistent as things are today. Sounds like a lot of extra work for minimal gain on a low rpm low compression street engine.

@Yo-mamashouse 2 жыл бұрын

What did the compression raise too?

@andysspeedshop7148 2 жыл бұрын

I have to look back at my notes but I think it came out to 9.2:1 but i could get it a lot higher by having the heads milled down or decking the block

@dirtlump 8 ай бұрын

So what happened ? did it run ?

@skidmark7199 7 ай бұрын

it would have cost less than 10 bucks to make a stand for next to the scale so you can weigh big end and small end.

@peggyparrow2059 Жыл бұрын

Smart move,great to see someone use their head for something other than to grow hair! Lol.

@chiefwraps7711 Жыл бұрын

You forgot to add assembly lube.

@71sixpak Жыл бұрын

That is NOT how you balance an assembly. There is a balance for the large and small end of the rod, not just for total weight. What you have done is made a huge mess out of it. Your motor is going to have a huge balance issue now. Do your research dude.

@cygnus1965 Жыл бұрын

No it won’t. While I may not like the removal of the top of the small end of the rod as long as all the piston and rod assemblies are the same give or take a couple 10’ths of a gram they will be fine. For a mild compression mild cam engine this is just fine. Would I do it this way for an all out race engine? Hell no! But this will be fine for many years to come.

@hankclingingsmith8707 Жыл бұрын

Weight match. Is 1st then balance

@wht240sxka Жыл бұрын

I was more concerned with the grinding of the connecting rod and not cooling it every few seconds. Seems like this would anneal it or something so one of the first times you give it the juice it may throw a rod through the block!?

@furyfantoo Жыл бұрын

@@wht240sxka I doubt you'll get it hot enough with a bench grinder to change any metallurgy. It's not getting anywhere as hot as the torch heating to press the piston pins in.

@wht240sxka Жыл бұрын

@@furyfantoo haha clearly you have never used a bench grinder. Ever ground a knife or rounded an edge of some metal? Can get cherry red hot in a matter of seconds. That is changing the metallurgy dude…

@rickyfulks889 Жыл бұрын

Nice blueprint😅

@scotthultin7769 Жыл бұрын

Meal ahead to make the combustion chamber is smaller gets flat top pistons with release for the valves put a big jam in there and have fun dome Pistons create a problem with the flame front until the dome is out of the way so it Rob's horsepower flat top pistons is the best way to go you can still accomplish 15 to 16 to 1 by milling the heads and making the combustion chamber or smaller