bob58o
SuckSqueezeBangBlow
Somebody asked me for a shopping list of parts and work to do on a mild Hemi Predator 212 Build. I figured why do this through PM's. Let everybody see.
I don't claim to be an expert.
My best advice is to call ARC or Email NR Racing for expert advice.
However; this thread is yours, should you choose to accept it. LOL
I just don't like private messages. They are too intimate for me.
Feel free to ask away here. I like trying to help. I will share whatever I know. Building up predators with other people's money never gets boring for me. LOLOLOL
This is basically the same as my current build thread, but a different manifold, different camshaft, and different flywheel. This is like a combination of all three of my hemi builds.
I tried to put together something that might make 15HP, have good bottom end, spin up to 7k RPM, run on pump gas, and last a long time.
I know you probably want a list of parts that will work without measuring, but that is not how you do this.
I STRONGLY RECOMMEND MEASURING AND CHECKING CLEARANCES BEFORE ORDERING PARTS. THESE SPECS CHANGE ALL THE TIME. KEEP 0.030" PISTON TO HEAD CLEARANCE. KEEP 0.065" PISTON TO VALVE CLEARANCE. (Others have said 0.050" piston to valve clearance is ok)
So here it goes...
Camshaft
Black Mamba Jr Cam GX200/Clone/Hemi
Should make good power from 3k to 6k+ RPM
https://www.smallenginecams.com/
Valve Train
SS Valves, 26lb Valve Springs, Aluminum Retainers, Split Middle Groove Keepers, Lash Caps
https://www.ombwarehouse.com/stainless-steel-upgrade-hemi-valve-kit.html
Chrome-Moly Pushrods
5.44" (Need Two of Them)
Guessing on the Length. You should Really Measure. 5.54" Might be correct length. 5.44" should work with SS valves, thin head gasket, and milling.
https://www.nrracing.com/product-p/cmpr-55.htm
Billet Lifters
http://www.nrracing.com/product-p/billetlifter200.htm
Connecting Rod
ARC 6256
3.328"
Need 1/4" 12 point socket to install
http://www.arcracing.com/6256-billet-rod-hf-predator-020-3-328-x-1-191-x-709/
Flywheel
ARC 6696
http://www.arcracing.com/6696-predator-212-hemi-speedway-billet-flywheel/
Intake
Manifold
http://www.gopowersports.com/manifold-for-6-5hp-clones-predators/
Carb
OKO 21mm
https://www.aliexpress.com/item/ZSD...32845830602.html?spm=a2g0s.9042311.0.0.J3kWPp
Might need a Jet Kit
https://www.aliexpress.com/item/New...9daRCuBTM8UelDOHuT6d9DoEM7nMpmmhoC68wQAvD_BwE
https://www.ebay.com/i/252381459287?chn=ps
Air Filter Screen
https://www.treatland.tv/OKO-air-filter-p/oko-air-filter-g1-48mm.htm
Prefilter
https://www.amazon.com/gp/product/B00KC641A2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
(you could save money and go with an air pod like this instead of the last two items, but I got one and it fell apart.)
http://www.ebay.com/bhp/48mm-pod-filter
Some people don't run air filters at all.
You will need a throttle cable with an end for a slide carb like in the photo. I won't link anything because I don't know the length you need.
Head Gasket
70mm Bore is correct
0.027" thick?
Guessing again. You really should measure how far in the hole your piston is.
https://www.nrracing.com/product-p/mls200hg.htm
Head Work
Milling
~0.020" to 0.025"
Again, you should measure and consider Piston to Valve Clearances
https://www.dynocams.com/
Three Angle Valve Job
https://www.dynocams.com/
Exhaust
Depends on what fits. Do you want a muffler?
1" OD pipe should work ok
Something staged from like 1" OD, to 1.125" OD, to 1.25" OD might be better
Something in the 1' to 3' range for length. 8" is as short as I would go.
This might be overkill. But I'd rather somebody spend the loot on upgraded parts, then blame me when they drop a stock valve. Do you really want to drop $600 or $700 on this build? You could probably get more power out of a different engine for less money. Tell me how much you want to spend and I make a shorter list.
SS Valves, CrMo pushrods, billet lifters might not be needed. I don't like the stock retainers so I upgrade my valves to use the better retainers/keepers.
The longer connecting rod, thinner head gasket, and milled head will increase compression, which is good. But will decrease clearances so you need to measure. Increased compression means higher octane. You should be fine with Premium Pump Gas with this set up. If you want to be conservative, don't mill and don't use a thinner gasket, but this might change which pushrods you need.
Since I send my heads out to get milled. I also get a three angle valve job, which should improve flow and make more power. It is not very expensive.
You can also port the head, but if you don't know what you are doing - then maybe just leave it alone. It is easily possible to hurt performance if you just start messing around in the ports with out flow bench testing.
You might need a gasket kit to replaced messed up ones when you take it apart.
https://www.nrracing.com/product-p/gasketkit-65-hemi.htm
I FEEL THESE PARTS WHEN PROPERLY INSTALLED SHOULD MAKE A WELL-BUILT ENGINE THAT SHOULD GO TOGETHER FAIRLY EASILY WITHOUT TOO MANY CUSTOM MODIFICATIONS. BUT YOU NEED TO MEASURE STUFF. I TAKE NO RESPONSIBILITY FOR ANYONE'S LACK OF DUE DILIGENCE.
I don't claim to be an expert.
My best advice is to call ARC or Email NR Racing for expert advice.
However; this thread is yours, should you choose to accept it. LOL
I just don't like private messages. They are too intimate for me.
Feel free to ask away here. I like trying to help. I will share whatever I know. Building up predators with other people's money never gets boring for me. LOLOLOL
This is basically the same as my current build thread, but a different manifold, different camshaft, and different flywheel. This is like a combination of all three of my hemi builds.
I tried to put together something that might make 15HP, have good bottom end, spin up to 7k RPM, run on pump gas, and last a long time.
I know you probably want a list of parts that will work without measuring, but that is not how you do this.
I STRONGLY RECOMMEND MEASURING AND CHECKING CLEARANCES BEFORE ORDERING PARTS. THESE SPECS CHANGE ALL THE TIME. KEEP 0.030" PISTON TO HEAD CLEARANCE. KEEP 0.065" PISTON TO VALVE CLEARANCE. (Others have said 0.050" piston to valve clearance is ok)
So here it goes...
Camshaft
Black Mamba Jr Cam GX200/Clone/Hemi
Should make good power from 3k to 6k+ RPM
https://www.smallenginecams.com/
Valve Train
SS Valves, 26lb Valve Springs, Aluminum Retainers, Split Middle Groove Keepers, Lash Caps
https://www.ombwarehouse.com/stainless-steel-upgrade-hemi-valve-kit.html
Chrome-Moly Pushrods
5.44" (Need Two of Them)
Guessing on the Length. You should Really Measure. 5.54" Might be correct length. 5.44" should work with SS valves, thin head gasket, and milling.
https://www.nrracing.com/product-p/cmpr-55.htm
Billet Lifters
http://www.nrracing.com/product-p/billetlifter200.htm
Connecting Rod
ARC 6256
3.328"
Need 1/4" 12 point socket to install
http://www.arcracing.com/6256-billet-rod-hf-predator-020-3-328-x-1-191-x-709/
Flywheel
ARC 6696
http://www.arcracing.com/6696-predator-212-hemi-speedway-billet-flywheel/
Intake
Manifold
http://www.gopowersports.com/manifold-for-6-5hp-clones-predators/
Carb
OKO 21mm
https://www.aliexpress.com/item/ZSD...32845830602.html?spm=a2g0s.9042311.0.0.J3kWPp
Might need a Jet Kit
https://www.aliexpress.com/item/New...9daRCuBTM8UelDOHuT6d9DoEM7nMpmmhoC68wQAvD_BwE
https://www.ebay.com/i/252381459287?chn=ps
Air Filter Screen
https://www.treatland.tv/OKO-air-filter-p/oko-air-filter-g1-48mm.htm
Prefilter
https://www.amazon.com/gp/product/B00KC641A2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
(you could save money and go with an air pod like this instead of the last two items, but I got one and it fell apart.)
http://www.ebay.com/bhp/48mm-pod-filter
Some people don't run air filters at all.
You will need a throttle cable with an end for a slide carb like in the photo. I won't link anything because I don't know the length you need.
Head Gasket
70mm Bore is correct
0.027" thick?
Guessing again. You really should measure how far in the hole your piston is.
https://www.nrracing.com/product-p/mls200hg.htm
Head Work
Milling
~0.020" to 0.025"
Again, you should measure and consider Piston to Valve Clearances
https://www.dynocams.com/
Three Angle Valve Job
https://www.dynocams.com/
Exhaust
Depends on what fits. Do you want a muffler?
1" OD pipe should work ok
Something staged from like 1" OD, to 1.125" OD, to 1.25" OD might be better
Something in the 1' to 3' range for length. 8" is as short as I would go.
This might be overkill. But I'd rather somebody spend the loot on upgraded parts, then blame me when they drop a stock valve. Do you really want to drop $600 or $700 on this build? You could probably get more power out of a different engine for less money. Tell me how much you want to spend and I make a shorter list.
SS Valves, CrMo pushrods, billet lifters might not be needed. I don't like the stock retainers so I upgrade my valves to use the better retainers/keepers.
The longer connecting rod, thinner head gasket, and milled head will increase compression, which is good. But will decrease clearances so you need to measure. Increased compression means higher octane. You should be fine with Premium Pump Gas with this set up. If you want to be conservative, don't mill and don't use a thinner gasket, but this might change which pushrods you need.
Since I send my heads out to get milled. I also get a three angle valve job, which should improve flow and make more power. It is not very expensive.
You can also port the head, but if you don't know what you are doing - then maybe just leave it alone. It is easily possible to hurt performance if you just start messing around in the ports with out flow bench testing.
You might need a gasket kit to replaced messed up ones when you take it apart.
https://www.nrracing.com/product-p/gasketkit-65-hemi.htm
I FEEL THESE PARTS WHEN PROPERLY INSTALLED SHOULD MAKE A WELL-BUILT ENGINE THAT SHOULD GO TOGETHER FAIRLY EASILY WITHOUT TOO MANY CUSTOM MODIFICATIONS. BUT YOU NEED TO MEASURE STUFF. I TAKE NO RESPONSIBILITY FOR ANYONE'S LACK OF DUE DILIGENCE.
Attachments
-
cable.jpg
