Rebuilding a Mopar 4.7 HO V8 I'm calling the SRT-HO OHC Hemi episode 1
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- čas přidán 27. 08. 2024
- The first episode of a series on rebuilding a Jeep 4.7 HO V8. This engine is going to take time. I am going to make it the best engine I have ever built and quite possibly my last. I hope I get to finish it.
I hope this will prove the power tech Mopar V8 is a great engine that should never have been cancelled. It is basically a overhead camshaft Hemi but people want to hang on to the past preferring the old Pushrod Hemi instead.
THIS IS REAL BACKYARD MECHANICS THAT CAN BE DONE AT HOME.
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All the mechanical repairs and services I do are done in our back yard.
So join me on my mechanical adventures so you have the confidence to have your own. I am always ready to help and will answer any questions as soon as possible.
Regards Rik
Been working on one as a father/sons project in an 03 Overland. Ported and polished the heads with all new seats. Polished the rods and bored it over .020 with new Perfect Circle pistons. Also went thru the block and really opened up the oil galleys, especially the oil filter supply area. I'm betting this one dropped a valve seat.
Oil issue is the rocker arms. Flooding the cam rather than injection of oil. They redesigned that problem with injection style rocker arms early 2000s. Also, Neglecting the oil changes can cause the lifters to collapse thus, the rocker falls off. So I keep the engine oil changed clean. no issues since
Yes correct they need regular oil changes. I changed to solid lifters/lash adjusters and they have been great.
Awesome, I love your channel I have a 4.7HO myself looking into either rebuilding or just buying a reman when it gives, you should perhaps make a rebuild guide (there are so many for the 4.0s none for the 4.7)
I'm sure there are plenty of people out there who would be interested in buying, myself included.
Hello Manny, This project is not on the starting blocks yet. I still need to finish the Black Beast first. I have a operation in a month on my neck and it will take 6 months to heal and recover and adjust. So please dont sit there waiting for me to start. I need to build a shed first. Do you follow me on FaceBook? I have plans for this engine that have not been done ever or world wide. I want to prove to Chrysler they made a BIG mistake to discontinue this engine in 2013.
Did you know the modern Hemi is not a Hemi anymore? The Powertech is more Hemi then the Hemi. It has a more Hemispherical combustion chamber than the new Hemi engines do. I would much prefer a OHC Hemi than a old style push rod engine from the 60's Hemi look alike. I am going to piss off a lot of die hard Hemi fans but I dont care I studied the facts and know the truth. The reason they continue selling the "Hemi" is because of the history behind it and the nostalgia.
Regards Rik
Whats the difference between the normal 4.7 and the 4.7 ho
@@cloroxbleach3367 check that out! its all there
www.wjjeeps.com/ho_engine.htm
@@cloroxbleach3367 30 HP ,,,,NOT MUCH IN HP & TORQUE... GOOGLE IT......I HAVE A 4.7 & 4.7 H.O.
Well some claim the difference is night and day.
My HO Overland certainly has plenty grunt but it cannot compete with the Red Jeep. In fact the engine I built has so much more power it surprised me. The HO has a stronger crank and rods, high compression pistons, different fuel injectors, modified intake manifold and camshaft upgrade. So not a lot more HP maybe but it runs quite a bit better than a stock 4.7.
Hi. Rik. I'm glad you're going to work on the H.O. project because I have the same engine in my wj. I'm very interested on how you rebuild it. I wish you good luck. Dominik from Croatia
It is a non urgent project so expect it to take up to a couple of years.
Thanks for the support from Croatia. Regards Rik
Good job bud
I have had both non and HO. the HO is good on gas and has more power
I have both but my built engine used less gas than my HO until I changed camshafts. But my rebuilt non HO has way more power than my HO. Next year I'm going to rebuild a spare HO engine but much wilder again. Thanks for watching Rik
Was a very maligned engine. Would have been fine for 1990; the time period for which AMC had intended it. It was especially vulnerable to damage from over-heating due to the valve lands popping out. It's a shame the industry didn't get behind it. It wouldve been nice to see how it really compared to the Ford 4.6 modular engine.
I agree they could have continued developing it.
@@BuiltByRik Unfortunately not. It was a deadend design when it was brought into production in 2002. The engine was a decade obsolete by then. Its retarded brother the 3.7 V6 utilized the same boring machines, and so preserved the 90° banks. In doing so it needed a whole host of tricks to bring the NVH into acceptable limits.
To make matters worse they increased the stroke of the V6 which was fundamentally unbalanceable. Guess who's V6 didn't get better fuel economy than the V8 it was derived from in every application where both were available.
I own a 04 overland. With the 4.7 h.o. I do love the engine. I have 129000 on it. How realible are they obviously coming from the 318... I'm hearing now about valve drop and catasprophoc faliure??
I too had a 318 and 360 and they were beasts in their day. The 4.7 is a different kinda beast it's a modern MOPAR high performance engine. It goes as good as the 318 and possibly the 360 but it did have some problems as it was a new design. I wish Chrysler had continued developing it into bigger V8s. If you service it regular with correct oil grade and you don't overheat it you should have no problems. My facebook page has the same name as my channel. Rik
I've had many of them, most common issue is overheating the engine will cause the valve seats to drop out and if they are run at all afterwards it will do serious damage to the cylinder piston and heads. It is also imperative that you change your oil on time every time, and do not run it with leaking head gaskets. This will sludge up the engine causing the lifters to collapse and your rocker arms to fling off.
Some cheap performance upgrades that make a huge difference are the 12 hole injectors. You can get them off of certain 05-08 chevy cars with the 2.3l engines. They substantially increase fuel mileage and horsepower. Also modifying the fuel rails to give each rail thier own direct feed line will equalize pressure across all injectors as well as keeping the fuel cooler which equates to increaseing the timing and more power. Do not attempt to turbo or supercharge these engines without first changing the pistons out. The top ring land on all stock 4.7 pistons is very thin and it will break off under any type of forced induction setup. Most aftermarket pistons have alleviated this weakness by increasing the meat above the top piston ring. I've also heard that 2008+ 4.7 camshafts are a slight improvement over the H.O camshafts, and that they will fit up perfectly in older cylinder heads. However you absolutely need to change out your valve springs in order to run the bigger cams as the stock ones are at the very edge of destruction when paired with the 08 cams.
I’ve got an ‘03 Dodge Durango. It has over 200,000. Royal Purple oil. It runs fine, but I can tell it’s getting loose, especially the heads and valve seats.
What is ho?
HO is a precursor to the SRT. It stands for High Output.
Too bad this was done three years ago, there's a lot of little tricks you can do when rebuilding these engines. First of all you use newer heads, but not the twin spark plug heads. You do not want to mess with twin spark plugs they are fully and completely unnecessary in this application. 2008 cams. And you also use fuel injectors from something about a 2005 to 2007 General Motors Saturn vehicles, and they are far superior than anything Chrysler ever put in and they do not cause engine codes. If you're going to keep the hydraulic lash adjusters, make sure you run Marvel Mystery Oil about a week before you do your oil change so that you can keep them clean enough so that they don't plug up. Otherwise you can put adjustable mechanical lash adjusters on the engine. The only issue with using the 2008 larger intake manifold is that you do have to manufacture a mechanically operated larger throttle body for that application to fit it on the older vehicle. That is not as difficult as you might think.
This engine has not been build yet but if you look at my channel I have done most thing you talked about with my first engine and much more.. Rik
@@44hawk28 reasoning for not using twin spark plug heads?
Two years on! I have a similar rebuild. Did yours not proceed?
Health has made it take a back seat. Just had surgery on Friday.
Still hope to do it when my shed is finished. Just purchased a big shed to play with my mechanical projects. Rik
So same bore stroke, cam, ? whats their differences?
They have a very mild Cam and high dome pistons for more compression. They heads are slightly different and the crank is made of a stronger metal. The injectors are slightly bigger and intake runners shorter on later models. So quite a few differences.
I wonder where you are getting the camshafts from???? all that's left are stock profiles. Seems better to step up to the 5.7l engine.
Each their own. You may not be aware the 5.7 was never a option in the WJ and the 4.7 is a more powerful engine.
Well each their own I guess in my opinion the 4.7 is the better motor and so did Chrysler but they listened to their customers who wanted the HEMI option. Still stuck in the past. Don't get me wrong I love the HEMI it's a great engine and a leap in technology when it was invented. But new technology has now overtaken the push rod engine and the 4.7 out performs the 5.7 is proof of this but the die hard Chrysler lovers cannot let go of the past. Imagine if they continued to improve the power tech increasing it to 5.7 or bigger versions you would drive a missile. But people wanted the Hemi so they introduced it again in the WK. The WJ never had that option and putting it in is a big job. I I'm a individual I do what I like and I think the 4.7 is a great new engine that just needed more time to be improved so sad it was not done. More power less fuel? Why not? Regards Rik
Ohhh to answer your cam question there is more than one way to skin a cat. I had some HO camshafts reprofiled to high street performance.
Is this a performance build?
no not yet maybe ill start toward the end of the year. no hurry
What I mean is... Are you going to build it for performance? Ya know... Cams, intake, stroker, ect.
Ohhhhh yes is there any other way. its going to make my current performance 4.7 look like a baby. Thats the plan
What kind of car is it going in? And any idea on power?
The jeep its what its out off. The jeep currently does 100kph under 6seconds. A lot of bits of the current engine will go onto this one. Performance parts are expensive so ill recycle. I dont talk power to many trolls start fighting but it will be ver healthy. ill tell power after dyno only.
tired of being told no way not possible?
I bet you its a rocker(s) causing no compression.
You putting a 2008 or newer intake on it? I just finished rebuilding the top end on my 2002 due to the previous owner overheating it. It seems they usually blow the head gasket around cylinder #1
Their worst problem is actually dropping valve seats and people using the wrong oil. I'm going to custom build a intake manifold. This will be my third 4.7 rebuild. It will take a few years to build it. Meanwhile ill continue playing with my current monster WJ Grand Cherokee 4.7. Check my channel for more. Regards Rik
Any idea how to quiet the top end on cold start? I put new lifters in when I had it apart, but it still has that rattle when cold
Hard to tell without seeing and hearing in person.
It is VERY important to use the correct oil in this engine. If your oil grade is to thick it will damage the engine. Also a quality oil filter with a non return valve is highly recommended. Check my channel on a clip about oil filters. Hope I was of some assistance. Regards HM
I use 5W30 with Mopar or WIX filters
Well in this case I'm not of much help as I have NEVER run my engine with Hydraulic lifters and I am unsure of how much they rattle in a normal situation? Maybe ask on my Facebook page Home Mechanics or Home Mechanics Man Cave.