I have just stroke up my b16b to 1.8 and rebulid the whole engine with Jun 3 cams and os ctr pistons (Cr aroung 12:1). I also have a power fc with the base map at the moment and I will be getting it tune after the car run in for about 1000 miles.

Is it safe to run in the engine without tuing the car with that high compression? Will the car be running lean on fuel?? and causes detonation?? But I cant really get the car tune now because they will have to drive it hard and the engine has not ran in yet. What shall I do??

I also have not got any fuel managemnet mod on it yet?? Is it necessary?? Will the B16b injectors be enough?? Is there any signs or things I can look out for if the car is running lean??

Thanks very much in advance for any help.

Andy


Modified by ek9lau at 12:01 AM 8/7/2003

 

Please Can I have some help on this??
Really need to know to stop myself worrying??

Thanks again

 

Anybody??

Please??

 

dont drive that **** with that kind of compression and no tuning. you are asking for a major headache. get it tuned before you end up having to make a post about how you drove your built motor with no tuning and no fuel upgrades and blew it up and how people should be sympathetic.

 

But how can I tune the car if is not run in yet.

Don't they need to run it hard when they are tuning.

 

By the time your car gets to the shop where they will tune it, it will be broken in. I have heard from alot of very educated honda builders that break in period is not as long as some people might think. I've heard that once you bring your motor from cold to temp 5 times its done. Also you will hear detonation sounds like pinging. If they are tunning it for part throttle they won't need to drive it very hard anyways. JMO.

 

yes, you can ran your vehicle. However, use your stock ecu for this. also advance your timing about 2 degree, use 92 octane with octane booster, replace your coolant and put in a mix of 70% water and 30% antifreeze. since higher compression builds up more heat 70/30 will help reduce combustion heat. also, install a slight colder plugs to further help reduce detenation and reignition.

also just drive your car normal
you should be fine

 

Shouldnt I retard the timing to prevent detonation and not to advance it.


thanks

 

For N/A motors, retarding the timing is really not need unlike motors that have force induction(turbo and supercharger) and nitrours.

Okay... let me explain to you why timing is retardation is important for nitrour and force induction motors vs N/A. oky, I'm go to use a fire place as comparision and explain a/f in relation to timing. I will referr fuel to wood - fire ventation to air, fire as combustion...

okay, with the wood burning and the fire place ventation door close - the wood burns at a slowe rate - now since the wood is being burned a slower rate, we what to retard timing - have the spark occur early. to have the maxium pressure after TDC timing retardation is required. norally on a honda motor maxium cylinder pressure occurs about 5 degrees ATDC. Now, if maxium pressure occur to late you will lose power and same it occur to early ATDC.

Now for nitrour and force induction vechicle.. let's go back to fire place thing.
have you ever notice that when wood is burning and you open the ventatation the fire get hotter and the wood burns at a faster rate vs to the vent close?

well when more air or oxygen is introduced the A/F leans out so more fuel is need. with more fuel burn and burning at a faster rate - the only way for us to maintain that maxium pressure after top dead center we must retard are timing (delay the spark).

I hope this answer your question.