High revving SBC
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Teching In
Joined: Jul 2005
Posts: 46
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High revving SBC What are the limiting factors to how high these SBC can rev?
Is it possible to make a 7000rpm-7500rpm SBC? (excluding the LS7)
What I'm really asking is what it would take for me to build a 7000rom-8000rpm SBC?
or is it just impossible?
Is it possible to make a 7000rpm-7500rpm SBC? (excluding the LS7)
What I'm really asking is what it would take for me to build a 7000rom-8000rpm SBC?
or is it just impossible?
Staging Lane
Joined: Jun 2006
Posts: 60
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Hi this is an add i have on racing junk for a camaro we have it explains what it takes we build this sort of motor be carefull of valve springs they are the killer in high rpm motors jz
it has a 355 SBC 1970 4 bolt OEM steel crank coated C/A bearings Z 28 style pump anti cavitation molodon pan 7 qt w/windage cloyes alloy timing cover w/roller, cam correct w/ L/S trencher crowler L/W rollers manley pushrods.080 black carbon finish Jessel rocker shaft 1.5 int 1.55 ext 5.7 eagle ESP H beam rods with 2000 bolts brc L/W pistons .090 wall pins 1600 bob weight C/A total seal type rings AFR down nozzle injected style 227 spread ported heads 208 int 160 ext 1.550 pac alloy comp springs TiT 10* retainers fluid damper balancer edel super victor manifold port matched and alky jet drilled with plugs HP series holley 750 race gas carb Mallory pump MSD 3 AL crank trigger MSD shoenfield stepped 1 3/4 to 1 7/8 X 3-1/2 collector 30 inch runners 9 inch collector sippers and egt bungs (lambus) both sides and they are rapped w/tan color rap REAR QA1 shocks ladder bar suspension 2818 lbs car with a 270 lb driver front is 1590 rear is 1498 -- 3088 total w/ driver runs in the cool 10:30 in the heat 10:50 foot breaking shifting at 8000 / 7800 traps one tenth trans braking faster with ( A ) cam motor will go as high as 8500 but is to small a cam so it only revs does not go any faster jz
it has a 355 SBC 1970 4 bolt OEM steel crank coated C/A bearings Z 28 style pump anti cavitation molodon pan 7 qt w/windage cloyes alloy timing cover w/roller, cam correct w/ L/S trencher crowler L/W rollers manley pushrods.080 black carbon finish Jessel rocker shaft 1.5 int 1.55 ext 5.7 eagle ESP H beam rods with 2000 bolts brc L/W pistons .090 wall pins 1600 bob weight C/A total seal type rings AFR down nozzle injected style 227 spread ported heads 208 int 160 ext 1.550 pac alloy comp springs TiT 10* retainers fluid damper balancer edel super victor manifold port matched and alky jet drilled with plugs HP series holley 750 race gas carb Mallory pump MSD 3 AL crank trigger MSD shoenfield stepped 1 3/4 to 1 7/8 X 3-1/2 collector 30 inch runners 9 inch collector sippers and egt bungs (lambus) both sides and they are rapped w/tan color rap REAR QA1 shocks ladder bar suspension 2818 lbs car with a 270 lb driver front is 1590 rear is 1498 -- 3088 total w/ driver runs in the cool 10:30 in the heat 10:50 foot breaking shifting at 8000 / 7800 traps one tenth trans braking faster with ( A ) cam motor will go as high as 8500 but is to small a cam so it only revs does not go any faster jz
http://s5.photobucket.com/albums/y19...nt=385dyno.flv
This is my 385 Cu.In. 9000 RPM engine. The video shows it going to 8000. It makes 589hp @7700 RPM and 449 Lb. Ft. @ 6000 RPM.
23* Iron Eagle platinum heads CNC'd to flow 333cfm @ .800
Jesel shaft rockers
PSI springs
These are really the only things that are not real common.
Eagle cast crank
SRP forged -16cc pistons
Crower 4340 rods
GM 4 bolt block
This is my 385 Cu.In. 9000 RPM engine. The video shows it going to 8000. It makes 589hp @7700 RPM and 449 Lb. Ft. @ 6000 RPM.
23* Iron Eagle platinum heads CNC'd to flow 333cfm @ .800
Jesel shaft rockers
PSI springs
These are really the only things that are not real common.
Eagle cast crank
SRP forged -16cc pistons
Crower 4340 rods
GM 4 bolt block
You can destroke a 400 to 377 cubic inches and basically have a bigger 302 that will make much more power, but still rev as high. Building a high revving motor isn't hard to do, its just making sure that the bottom end and valve train will support the rpms. I would recommend a solid roller if you are going to try to turn over 8 grand. I know higher rpms can be achieved with a sold flat tappet but the roller would spin higher easier and not have as much friction robbing horsepower.
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Teching In
Joined: Apr 2006
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this guy i know that races latemode... he has a 380" sbc.
4.155" bore x 3.50" stroke
its all aluminum, 2.08 heads w/ a crazy valve angle that flow in the 350's or so, 13.5-1 or so static comp, 1050 cfm carb, titanmum rods(i think), huge cam in the upper .7 :'s lift, and a host of other crap.
the engine builder said it made like way upper 800's at like 8900 rpm.
that would be sweet in a real deep geared street car... a setup like that wouldnt yield good hp below 4k though.
i almost put a 350 crank in my 400", but just bored it out instead. figure i didnt need the hi revver for the model a'
later
4.155" bore x 3.50" stroke
its all aluminum, 2.08 heads w/ a crazy valve angle that flow in the 350's or so, 13.5-1 or so static comp, 1050 cfm carb, titanmum rods(i think), huge cam in the upper .7 :'s lift, and a host of other crap.
the engine builder said it made like way upper 800's at like 8900 rpm.
that would be sweet in a real deep geared street car... a setup like that wouldnt yield good hp below 4k though.
i almost put a 350 crank in my 400", but just bored it out instead. figure i didnt need the hi revver for the model a'
later
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I ruin the end of films...
iTrader: (2)
Joined: Nov 2002
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From: Taking back some video tapes
A lightweight rotating assembly will go a long way in determining how high you can rev the engine w/o having the rods try to liberate themselves from the block. Dirt track and circle track motors are a great example of this. Of course, price out a 385 w/ SB2.2 or a 357 w/ some Yates SC1s and prepare to be amazed. 
Yeah it all depends on the parts. My friend has a Kriner-built 414 small block that will turn 9000-9200 no problem, and that is a HUGE stroke to be running that kind of RPM at. It has T&D shaft mount rockers, giant Isky triple valve springs, titanium valves, super nice carillo rods, and a Sonny Bryant crank. **** I think the crank in that motor is like $6200 new.
It runs alky and made ~860 HP, can't remember the power peak, but is was right around 8200-8500. It also sits in a 1220 pound car.
It runs alky and made ~860 HP, can't remember the power peak, but is was right around 8200-8500. It also sits in a 1220 pound car.
I ruin the end of films...
iTrader: (2)
Joined: Nov 2002
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From: Taking back some video tapes
On the topic of high dollar cranks, a friend of mine has a rotating assembly for a 4xxci Ford that uses an LAE Kryptonite crank and Carrillo rods. He got it for cheap from a guy who was neck deep in depth, but still paid $2,000 for the rods and crank. 
High rpms = more maintenance. 
On The Tree
Joined: Oct 2005
Posts: 123
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with the way technology has evolved, there is no real reason to do a 377 out of a 400, or a 327 from a 350 anymore. nowadays the balancing is capable of being much more precise, which is a big part of a motor staying together at the higher rpms. just remember, though, the more cubes, the less rpm that is needed to make the power. id preferably take and build a 406 with some decent heads, only sping 5500-6000rpm, and keep it for quite some time, and make some good hp/tq without breaking the bank on parts
Launching!
Joined: Oct 2005
Posts: 202
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Originally Posted by zoxygen
What are the limiting factors to how high these SBC can rev?
Is it possible to make a 7000rpm-7500rpm SBC? (excluding the LS7)
What I'm really asking is what it would take for me to build a 7000rom-8000rpm SBC?
or is it just impossible?
Is it possible to make a 7000rpm-7500rpm SBC? (excluding the LS7)
What I'm really asking is what it would take for me to build a 7000rom-8000rpm SBC?
or is it just impossible?
how does 9k sound(motor has seen 10k 24 yrs ago) Lt1 pink rods, steel crank and trw forged pistons. It dont seem like much as far as parts, but im 24yrs old and this motor is one my dad raced in 1977. It has just been ringed and bearing. [IMG]
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TECH Regular
Joined: Oct 2004
Posts: 411
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This guy wants a V-TEC Honda engine it sounds like. Not a lot of power at a huge RPM and really streetable. 99% of us here try not to build something impractical and inefficient. You're asking how to turn pieces of metal really fast and you're not seeing the whole picture. 400+ hp can be made at 5500rpm with a common crate engine and very few aftermarket parts.
I suggest a Honda Civic with a turbo kit. Spin it to the moon and impress everyone with your 6" tachometer.
I suggest a Honda Civic with a turbo kit. Spin it to the moon and impress everyone with your 6" tachometer.