Serious 340 build into 361 HiRPM Screamer

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RAMM

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I've been waiting to really begin on this build and I'm not waiting any longer. The plan was to build this for the EMC competition in 2020 but the corona agenda pretty much ended all of that and any and all travel into the US is forbidden for well.....

I've decided to pull out all the stops and build this with no real rules to follow. There will be compromises of course as this does have to run on pump premium 91-94 available here and it does have to have a modicum of manners of driveability. Looking for peak HP in the 540 range @ 7000-7300 RPM--the torque will take care of itself. This engine is destined for my Shop/Promo Truck which is a '83 Shortbox D150 lowered, 275/18 and 305/19 mated to a Supra R154 with a 3.9L V6 Dakota bellhousing.

The build:
340 block 4.08" -4.100" bore
318 Forged crank offset ground 3.450 stroke 1.850" RJ (Solid Rod Journal)
Pankl 6.200" rods .708" pin
Custom Mahle Forgings with their amazing 1mm/1mmNapier/2mm ring pack
EQ heads (Australian castings hopefully)
T&D Stainless Rockers 1.7/1.8 mated to custom machined bedplate
Custom Solid Flat Tappet (Rollers are too failure prone for real street use and mileage)
Schubeck Flat tappets
Weiand 7545 X-celerator
Holley XP 650-750
Hedman truck headers with some custom touches

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Emphasis will be put on friction reduction, machining accuracy, induction balance/speedstability with the maximum required flow level of about 270cfm, cylinder pressure, oil control, and valvetrain stability. Looking to for a static compression of 10.8-11.0. Planning on using piston, valve, chamber, coatings as well as oil shedding coatings in the crankcase.

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Lifters.jpg


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Weiandcovers.jpg
 
Sounds like a road racing inspired build. I’m in, this will be good.
 
RAMM said:
You are very very warm. If I do it really well I'm told the no truck policy will be overlooked for me at Calbogie. J.R.
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Nice. Can’t wait. I had to look up what Calbogie was. Looks like a beautiful track.
 
So even the best roller lifters... you are deeming not suitable for real street driving.
The next "what roller lifter should I use" will see this as good kindling! :D So then the solid flat tappet is more reliable, no debating it's pretty reliable alright...the shubeck don't hurt either! Lol
 
MOPAROFFICIAL said:
So even the best roller lifters... you are deeming not suitable for real street driving.
The next "what roller lifter should I use" will see this as good kindling! :D So then the solid flat tappet is more reliable, no debating it's pretty reliable alright...the shubeck don't hurt either! Lol
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Yeah! I think those lifters gave me a little wood lol.:rolleyes:
 
Awesome build…are you looking for some Australian EQ heads…I know that a few sets got sold here a few years ago and might not have been used… who is going to grind the solid cam for you… I’m going custom solid on my 416 build… for the same reason as you
 
MOPAROFFICIAL said:
So even the best roller lifters... you are deeming not suitable for real street driving.


The next "what roller lifter should I use" will see this as good kindling! :D So then the solid flat tappet is more reliable, no debating it's pretty reliable alright...the shubeck don't hurt either! Lol
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MOPAROFFICIAL said:
So even the best roller lifters... you are deeming not suitable for real street driving.
The next "what roller lifter should I use" will see this as good kindling! :D So then the solid flat tappet is more reliable, no debating it's pretty reliable alright...the shubeck don't hurt either! Lol
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You can run whatever you want, I don't trust them. J.Rob
 
67autocross said:
Awesome build…are you looking for some Australian EQ heads…I know that a few sets got sold here a few years ago and might not have been used… who is going to grind the solid cam for you… I’m going custom solid on my 416 build… for the same reason as you
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Yes! I've been looking for a set for some time now, I appreciate any help locating a set for purchase.
I'd probably work with Comp Cams on the lobe design considering the high rocker ratios. Yep, solid rollers eventually spit their axles out. I fully plan on getting on 400 series highways and maintaining 120-130km/hr which will be 2800-3000rpm for hours on end, I don't want to be thinking about roller lifters putting me on a flatbed. J.Rob
 
ir3333 said:
Sounds awesome!
Why did you select 361 ci?
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Good question. I just wanted a stroke bump for a little more torque but still want the high rpm low stress of a great rod ratio. It also keeps the crank journal overlap from getting out of hand. J.Rob
 
MOPAROFFICIAL said:
I hear ya.
Nice to see all of our different experience based concerns. Thanks for posting.
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Monday or Tuesday I can post some pics of some very Big $$$ custom short travel hyd rollers that have about 2000kms on them. You won't catch this failure by keeping an eye on lash either. There's just too much load on those little itty bitty parts. J.Rob
 
RAMM said:
Yes! I've been looking for a set for some time now, I appreciate any help locating a set for purchase.
I'd probably work with Comp Cams on the lobe design considering the high rocker ratios. Yep, solid rollers eventually spit their axles out. I fully plan on getting on 400 series highways and maintaining 120-130km/hr which will be 2800-3000rpm for hours on end, I don't want to be thinking about roller lifters putting me on a flatbed. J.Rob
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I’ll shake the bushes around here for a set of EQs…. You know well how get them flowing a lot better than 270
I might go with a Straub Cam if he will do a sbm…. My friend gets lots of cams from him with good results
 
Good thing you have the lifters. Schubeck sold out to "Smith" many years ago, but I havn't heard anything about them for several years. (Not Smith Pushrods or Clay Smith.) People either love them or hate them. No cam break-in concerns and it's actually better to run more spring pressure than required than taking a chance on not enough (Avoid valve float at all costs.). If something goes wrong and they shatter, the little super-hard shards damage most on the internal parts.

I've run their hydraulic & solids in my NHRA and IHRA Stock class cars without a problem. But a few haven't been as fortunate over the years.

Is checking/correcting the lifter bore angles & clearances an option worth considering.

Direct Connection use to sell cranks around 3.454" and 3.51". But it's beeen decades and don't know if any may be still stashed away. That's a big offset grind otherwise.

Would destroking an aftermarket 318/340 main 3.58" stroke crank offer any strength advantages worth considering? Not sure how the forging material would compare.

Rods look light and pistons probably "featherweight"?
 
Those are cool looking rods.

Watching with great interest!
 
Projectile Dart said:
Supra 5-speed behind a stout 340? I NEED to know more about this. Do you have a build page for the truck itself?
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“Toyota Motor Corporation's R family is a family of 5-speed RWD/4WD transmissions built by Aisin. They share much in common (such as the bell housing-to-body bolt patterns) with the Aisin AR transmission (rebadged MA-5 by GM, AX-15 and NV3550 by Jeep, and Isuzu AR5)”

Similar to Dakota 5 speeds externally. Different ratios. They can handle some pretty good power but torque and traction can kill em.
 
RAMM said:
Emphasis will be put on friction reduction, machining accuracy, induction balance/speedstability with the maximum required flow level of about 270cfm, cylinder pressure, oil control, and valvetrain stability. Looking to for a static compression of 10.8-11.0. Planning on using piston, valve, chamber, coatings as well as oil shedding coatings in the crankcase.

View attachment 1715773802

View attachment 1715773803

View attachment 1715773804

View attachment 1715773805
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nICE ROCKERS
RAMM said:
I've been waiting to really begin on this build and I'm not waiting any longer. The plan was to build this for the EMC competition in 2020 but the corona agenda pretty much ended all of that and any and all travel into the US is forbidden for well.....

I've decided to pull out all the stops and build this with no real rules to follow. There will be compromises of course as this does have to run on pump premium 91-94 available here and it does have to have a modicum of manners of driveability. Looking for peak HP in the 540 range @ 7000-7300 RPM--the torque will take care of itself. This engine is destined for my Shop/Promo Truck which is a '83 Shortbox D150 lowered, 275/18 and 305/19 mated to a Supra R154 with a 3.9L V6 Dakota bellhousing.

The build:
340 block 4.08" -4.100" bore
318 Forged crank offset ground 3.450 stroke 1.850" RJ (Solid Rod Journal)
Pankl 6.200" rods .708" pin
Custom Mahle Forgings with their amazing 1mm/1mmNapier/2mm ring pack
EQ heads (Australian castings hopefully)
T&D Stainless Rockers 1.7/1.8 mated to custom machined bedplate
Custom Solid Flat Tappet (Rollers are too failure prone for real street use and mileage)
Schubeck Flat tappets
Weiand 7545 X-celerator
Holley XP 650-750
Hedman truck headers with some custom touches

View attachment 1715773789

View attachment 1715773790

View attachment 1715773791
Click to expand...
Not really looking for a debate but I will kindly disagree with you on the roller cam/lifter issue for a street driven vehicle as being problematic. I have ran 2 different horsepower level engines on the street with significant time and raced both packages and both engines used different brand of not only cams but also lifters with zero issues. Obviously your statement was probably formed off of personal experience which I respect but at the same token my personal experiences produced different results.
 
'68cuda416 said:
nICE ROCKERS

Not really looking for a debate but I will kindly disagree with you on the roller cam/lifter issue for a street driven vehicle as being problematic. I have ran 2 different horsepower level engines on the street with significant time and raced both packages and both engines used different brand of not only cams but also lifters with zero issues. Obviously your statement was probably formed off of personal experience which I respect but at the same token my personal experiences produced different results.
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No debate possible, I'm not trying to talk anyone out of or into anything. That's the great thing about Western civilization- freedom of choice, you build it your way, I'll do it my way. Appreciate the comment anyways, J.Rob
 
TT5.9mag said:
“Toyota Motor Corporation's R family is a family of 5-speed RWD/4WD transmissions built by Aisin. They share much in common (such as the bell housing-to-body bolt patterns) with the Aisin AR transmission (rebadged MA-5 by GM, AX-15 and NV3550 by Jeep, and Isuzu AR5)”

Similar to Dakota 5 speeds externally. Different ratios. They can handle some pretty good power but torque and traction can kill em.
Click to expand...

No torque or real traction from a stop here, I'm aware of the transmissions limits. Thanks for the help with the info. J.Rob
 
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