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Discussion Starter · #1 ·
Greetings yall.

Actually on a k20/24 frank na build i would like to know what should be a safe rpm limit for this following setup :

k24a jdm stock block well taken care of
K20a2 non vtec PPL head
type s oilpump
S2 ajustable cam gears
Supertech double springs retainers and seats
dc3.2 cams
Vteckiller so exhaust rockers ground to fit.

According to dc, peak power should be around 8k and maintain till 8.5k.
At 8.5krpm its a stuning 92 feet per sec speed thats why i am asking even if this engine have a good rod ratio..

So, can i, with the setup listed above, rev it till 8.5k rpm safely?


Thank in advance!
 

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Safe rev limit for a stock k24 block would be around 7500. Much above that your going to start wearing things very quickly and will push into the fatigue limits of lots of stock components very quickly as well.
 

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2002 DC5 Type S
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From the mods you described you should not be revving above 8,000 rpm on stock pistons and rods regardless if you have the PRB oil pump. The survival of the engine will come down the quality of oil and how often you change it and how well you take care of it, not just keeping foot out of throttle.
 

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2002 DC5 Type S
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Using 10w60 synthetic + hyper lubricant additive
I have always used AMSOIL 10w-30 Turbo Formulated synthetic oil for boosted projects and AMSOIL filter. They claim it is good for over 15,000 miles to 25,000 miles depending on factors of the engine's use. Just the basic (entry level) oil
Signature Series Synthetic Motor Oil

  • Normal Service – Up to 25,000 miles (40,200 km), 700 hours of operation or one year, whichever comes first, in personal vehicles not operating under severe service.
  • Severe Service – Up to 15,000 miles (24,140 km), 700 hours of operation or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; excessive idling; or frequent towing, hauling, plowing or driving in dusty conditions.

What I did with my boosted (low boost) K24a2, which was a brand new zero mile longblock purchased directly Acura's infamous "trainwreck" salvage ordeal, was changing the "expensive" oil around 3,000 to 6,000 miles & filter. This engine was broken in with a blower on it and I owned it for 42,000 miles. I put the engine through it's paces on road courses, minor dig street racing, grudge roll racing and I had the rev limiter set at 8,000 rpm's (2004 K24a2 engine w/o PRB Type S oil pump). Did I always take it to 8,000 rpm? No, I typically would shift at 7,200 rpm to 7500 rpm and only used the 8,000 rpm when I felt I needed to. I cannot tell you the exact percentage of how many times I hit 8,000 rpm - it was not a low percentage. When the car was re-dyno'd at 42,000 miles for a baseline, we had lost around 5whp from the start of it.

This is my personally experience and not everyone else will share the same results. If you use good oil and change it well before the suggested change time, it will only help your cause. Allowing the engine to completely warm up from head to toe, lets say 10 mins of normal driving before wide open throttle, will preserve the engine's lifespan and performance. This was a tip from a 30 year plus Honda specialist. He said ," they beat on them cold and wonder why the piston rings fail fast, the valves go to shit and do not seal correctly after a shirt period of time, valves seats suffer, bearings, everything suffers," and ,"All of which can be prevented by good oil, changing it before it well before it starts to wear down, and treating the engine with respect before you disrespect it."
 

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Discussion Starter · #6 ·
I have always used AMSOIL 10w-30 Turbo Formulated synthetic oil for boosted projects and AMSOIL filter. They claim it is good for over 15,000 miles to 25,000 miles depending on factors of the engine's use. Just the basic (entry level) oil
Signature Series Synthetic Motor Oil

  • Normal Service – Up to 25,000 miles (40,200 km), 700 hours of operation or one year, whichever comes first, in personal vehicles not operating under severe service.
  • Severe Service – Up to 15,000 miles (24,140 km), 700 hours of operation or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; excessive idling; or frequent towing, hauling, plowing or driving in dusty conditions.

What I did with my boosted (low boost) K24a2, which was a brand new zero mile longblock purchased directly Acura's infamous "trainwreck" salvage ordeal, was changing the "expensive" oil around 3,000 to 6,000 miles & filter. This engine was broken in with a blower on it and I owned it for 42,000 miles. I put the engine through it's paces on road courses, minor dig street racing, grudge roll racing and I had the rev limiter set at 8,000 rpm's (2004 K24a2 engine w/o PRB Type S oil pump). Did I always take it to 8,000 rpm? No, I typically would shift at 7,200 rpm to 7500 rpm and only used the 8,000 rpm when I felt I needed to. I cannot tell you the exact percentage of how many times I hit 8,000 rpm - it was not a low percentage. When the car was re-dyno'd at 42,000 miles for a baseline, we had lost around 5whp from the start of it.

This is my personally experience and not everyone else will share the same results. If you use good oil and change it well before the suggested change time, it will only help your cause. Allowing the engine to completely warm up from head to toe, lets say 10 mins of normal driving before wide open throttle, will preserve the engine's lifespan and performance. This was a tip from a 30 year plus Honda specialist. He said ," they beat on them cold and wonder why the piston rings fail fast, the valves go to shit and do not seal correctly after a shirt period of time, valves seats suffer, bearings, everything suffers," and ,"All of which can be prevented by good oil, changing it before it well before it starts to wear down, and treating the engine with respect before you disrespect it."
Thank you for this great input
 
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