Originally Posted by
Eric 90 integra
i was wondering i have a 90 integra and i have a after market tack that says the car will rev to 8,000 or 9,000 rpm but it wont cuzz its set stock at i think 6 or 7,000rpm be for it hits the rev limiter i dont want to float a valve? so how much would it cost to put stonger valve springs in so i could rev out to 8,000?
First, there's no point in upgrading the valve springs and retainers if you're going to run the OEM cams. They're already running out of breath by 6100 rpm, so all you'd be making is more noise.
Secondly, it's not just the risk of valve float that determines your redline. The con-rod main bearings are not designed for constant use above 7000 rpm. If you want to build your B18A1 motor for continual high-rpm use, there are a series of upgrades that have to occur to preserve a reasonable level of reliability.
That said, there are cams available for the B18A1 that would justify the expense of stronger valve springs and retainers, while still making power in the rpm range your OEM con-rods can handle. Start by looking at Crower Cams.