What is wrong with mmr parts????

[luillo]

I was wondering why almost every body hates MMR Parts????

what is going on??

i was looking to buy the 351 Modular Engine they sell but with all this post about their part i am very scare to spend $3200 on that.

Please post you thought or experience with MMR Parts here to learn.

Thanks...

 

[thump_rrr]

From what I have heard all of their blocks are bored 0.020 over right from the start.
If you run into any kind of problem there is no room to have it machined again for a second time.

 

[94tbird]

Please search. there are TONS, literally TONS ofthreads on the subject here, as well as across the internet on their "GREAT" parts lol

 

[luillo]

Please search. there are TONS, literally TONS ofthreads on the subject here, as well as across the internet on their "GREAT" parts lol

On their part??? i will look now thanks....

 

[Miracle]

I have ordered several times from MMR, and never had a problem.

 

[KrisR]

We'll see how my MMR 800 shortblock works here in just a few days. Well...initial startup will be in a few days, final dyno tune in a week or two. Friend of mine has a MMR 950 stroker shortblock in his 03 Cobra and so far its been fantastic.

Yes, I realize there's a lot of negativity about MMR on the internets.

So far, my customer service experience has been good. Hopefully everything works out well.

 

[slicksilver]

Just say NO to MMR.

If you are looking into a motor, I'd suggest ProLine Racing Engines, Al Pappito at Boss 330, and LIVERNOIS motorsports.

Livernois is what I'd go with, actually.

 

[Stangtuner]

One has to keep in mind that nomatter the company, there will be customers with good AND bad experiences. Wether it's MMR, or McDonald's.

 

[94tbird]

One has to keep in mind that nomatter the company, there will be customers with good AND bad experiences. Wether it's MMR, or McDonald's.

And when the bad heavily outweighs the good?

 

[retfr8flyr]

MMR bores all the blocks .030 over not .020 so you pay for a brand new block and will not be able to rebuild it in the future as that is the most you would want to bore the block. I have one of their shortblocks and there is something wrong with the snout of the crankshaft. I can't stop oil leaking from the crank seal. I also had other problems with them and would not recommend them for anything.


Earl

 

[Lazy Racer]

And when the bad heavily outweighs the good?

Go to Burger king

 

[Mike@PowerHouse]

I recently tore down an 1800mi motor that was purchased by a customer from said company, typical combo, Cobra crank, Manley rods and pistons and someone elses rings.

This engine was standard bore, with Ford line hone and cylinder hone marks. All bearing were standard sized. Rotating assembly appeared to be balanced.

It used all original fasteners through out including main caps.

This engine was broken in properly and ran the hone out of the cylinders as well as tore up the rings in very short order. Have a ton of compression issues.

Keep in mind you get what you pay for. Cheap is as Cheap does.

 

[SD07GT]

I recently tore down an 1800mi motor that was purchased by a customer from said company, typical combo, Cobra crank, Manley rods and pistons and someone elses rings.

This engine was standard bore, with Ford line hone and cylinder hone marks. All bearing were standard sized. Rotating assembly appeared to be balanced.

It used all original fasteners through out including main caps.

This engine was broken in properly and ran the hone out of the cylinders as well as tore up the rings in very short order. Have a ton of compression issues.

Keep in mind you get what you pay for. Cheap is as Cheap does.

More in likely torque plates weren't used on the hone and incorrect stones on the ball hone ?

 

[Mike@PowerHouse]

It was Fords hone, I am unsure of their process, but the cylinder walls were completly polished, leaving nothing to retain oil. This lack of oil and ring tension wore the rings pretty quickly.

 

[Lazy Racer]

I would have thought it obvious that people going for forged internals will be using a major power adder...

 

[lostsoul]

F MMR! Dons still waiting for his refund for a part that didn't fit. Also we are all still waiting to hear some answers from mmr in another thread. Once the questions started to roll in they bailed. No company is perfect but what they do after reply tells you about them.

 

[kleistang]

I wonder how many pages this one would go through.

haha subscribing

 

[EagleStroker]

I would have thought it obvious that people going for forged internals will be using a major power adder...

Assumptions aren't always correct...

I won't say anything against MMR as they use the same parts most "big builders" do, and I have no personal experience with them to speak of.

 

[alloy6ix]

Assumptions aren't always correct...

Yeah, you and you're NA stroker motor in an alloy car....










fucker... lol

and I've never had any dealings with MMR, I know someone who's purchased through them, but smaller things without hassle, but not motors. Keep doing research...

 

[Blazing Saddles]

It was Fords hone, I am unsure of their process, but the cylinder walls were completly polished, leaving nothing to retain oil. This lack of oil and ring tension wore the rings pretty quickly.

Not to stand up for MMR, but thats usually an indication that the cylinder walls were fuel washed. I've never heard of this happening with a factory hone.