11 replies to this topic

[crf150]

I have a spare 998 engine lying around just wanted to get some advice on what I should do with it, planing on stripping it right down and rebuilding it from scratch, I don't want to spend 000's on it(mightier that much as it's not something that happens all the time!) but I have a nice steady flow of money so can get quite a few bits here and there,. Everyone's thoughts? What have you done to your engine ?

[sonikk4]

Cheap and cheerful would be a stage one kit but as yours is in bits then i would look at getting some head work done and then fit a decent camshaft.

 

It might pay you to pm either Cooperman or ACDodd and pick their minds, a wealth of experience there.

[BritishRacingGreen]

If you don't need it urgently I'd be thinking about doing as much of the work myself. A lot of performance can be gained by building to fine tolerances, AC Dodd has lots of info on this though I can't remember where I read it. Also have a read of Visard's book, gives you a lot of info on how to modify things to increase performance. Things like how to modify a cylinder head, inlet and exhaust and the carb. I'd buy myself a dremel and do the modifications myself.

[crf150]

I am planning on doing most of the work myself and minimal work being sent to someone else to do, I already have an engine built ready to put into my mini once it has been restored, and then I have this engine which I am intending to modify, I will speak to AC Dodd to get some more info, is there a link to visards book ? Or where can I find it ? What work would you considering to be doing with a dremel? Thanks for the info!

If you don't need it urgently I'd be thinking about doing as much of the work myself. A lot of performance can be gained by building to fine tolerances, AC Dodd has lots of info on this though I can't remember where I read it. Also have a read of Visard's book, gives you a lot of info on how to modify things to increase performance. Things like how to modify a cylinder head, inlet and exhaust and the carb. I'd buy myself a dremel and do the modifications myself.

Cheap and cheerful would be a stage one kit but as yours is in bits then i would look at getting some head work done and then fit a decent camshaft.
 
It might pay you to pm either Cooperman or ACDodd and pick their minds, a wealth of experience there.

[Turbo Phil]

A dremel is next to useless on most engine parts, there's certainly no way you'd be able to port a cylinder head with one, not unless you live to be 100 years old.
Here's a link to the David Vizard book. http://www.ebay.co.u...9ec#ht_82wt_958
It's quite old now but there's some solid info contained in it & it's certainly worth owning.

Phil.

[BritishRacingGreen]

A dremel is next to useless on most engine parts, there's certainly no way you'd be able to port a cylinder head with one, not unless you live to be 100 years old.
Here's a link to the David Vizard book. http://www.ebay.co.u...9ec#ht_82wt_958
It's quite old now but there's some solid info contained in it & it's certainly worth owning.

Phil.

Really? What does everyone use for cylinder head porting and carb modifications then?

[crf150]

Are there any website that I can read through the book on PDF or anything ? If not I will end up purchasing the one on ebay

[Turbo Phil]

A cheap die grinder & some carbide burrs will do the job far far quicker & easier than a dremel ever will.

Phil.

[crf150]

Already own a doe grinder :)

[Mini Manannán]

 

A dremel is next to useless on most engine parts, there's certainly no way you'd be able to port a cylinder head with one, not unless you live to be 100 years old.
Here's a link to the David Vizard book. http://www.ebay.co.u...9ec#ht_82wt_958
It's quite old now but there's some solid info contained in it & it's certainly worth owning.

Phil.

Really? What does everyone use for cylinder head porting and carb modifications then?

 

Ye olde dentist's drill here.  8000rpm!

[minimender]

If you are grinding the ports out then wear a mask or you will suffer later in life

[Cooperman]

Ear defenders too, or, like me, you'll end up with tinnitus and that truly is not pleasant!